82 lines
1.6 KiB
C++
82 lines
1.6 KiB
C++
#include <iostream>
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#include <cmath>
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#include <stack>
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using namespace std;
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const int MAXN = 1805;
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int a[2][MAXN], vst[MAXN], cnt;
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int myS[MAXN][MAXN], top[MAXN];
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void init()
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{
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memset(vst, 0, sizeof(vst));
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}
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void dfs(int x)
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{
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cnt++;
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vst[x] = 1;
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int nx = a[1][x];
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if(!vst[nx])
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{
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dfs(nx);
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}
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}
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__int64 gcd1(__int64 a, __int64 b)
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{
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__int64 r = b, t;
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while(r)
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{
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t = r;
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r = a % r;
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a = t;
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}
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return a;
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}
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__int64 gcd2(__int64 a, __int64 b)
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{
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return b == 0 ? a : gcd2(b, a % b);
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}
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int main(void)
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{
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int n, k;
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while(scanf("%d %d", &n, &k), n || k)
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{
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init();
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for(int i = 0; i < n; i++)
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{
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int in = i % k;
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myS[in][top[in]++] = i;
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}
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int s = 0;
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for(int i = 0; i < n; i++)
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a[0][i] = i;
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for(int in = 0; in < k; in++)
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{
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while(top[in])
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{
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a[1][s++] = myS[in][--top[in]];
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}
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}
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int c = 0;
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__int64 res[MAXN];
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for(int i = 0; i < n; i++)
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{
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if(!vst[i])
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{
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cnt = 0;
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dfs(i);
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res[c++] = cnt;
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}
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}
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__int64 tmp;
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if(c >= 2)
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{
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tmp = res[0] / gcd2(res[0], res[1]) * res[1];
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for(int i = 2; i < c; i++)
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tmp = tmp / gcd2(tmp, res[i]) * res[i];
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}
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else if(c == 1)
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tmp = res[0];
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printf("%I64d\n", tmp);
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}
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return 0;
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}
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