62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
#include <stack>
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#include <cstdio>
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#include <list>
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#include <cassert>
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#include <set>
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#include <iostream>
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#include <string>
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#include <vector>
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#include <queue>
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#include <functional>
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#include <cstring>
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#include <algorithm>
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#include <cctype>
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#include <string>
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#include <map>
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#include <cmath>
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using namespace std;
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#define LL long long
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#define ULL unsigned long long
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#define SZ(x) (int)x.size()
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#define Lowbit(x) ((x) & (-x))
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#define MP(a, b) make_pair(a, b)
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#define MS(arr, num) memset(arr, num, sizeof(arr))
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#define PB push_back
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#define X first
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#define Y second
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#define ROP freopen("input.txt", "r", stdin);
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#define MID(a, b) (a + ((b - a) >> 1))
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#define LC rt << 1, l, mid
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#define RC rt << 1|1, mid + 1, r
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#define LRT rt << 1
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#define RRT rt << 1|1
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const double PI = acos(-1.0);
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const int INF = 0x3f3f3f3f;
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const double eps = 1e-8;
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const int MAXN = 1e7 + 2;
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const int MOD = 1e9 + 7;
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const int dir[][2] = { {-1, 0}, {0, -1}, { 1, 0 }, { 0, 1 } };
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int cases = 0;
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typedef pair<int, int> pii;
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LL get_phi(int n)
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{
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int m = (int)sqrt(n+0.5);
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int ans = n;
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for (int i = 2; i <= m; i++) if (n % i == 0)
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{
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ans = ans / i * (i-1);
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while (n % i == 0) n /= i;
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}
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if (n > 1) ans = ans / n * (n-1);
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return ans;
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}
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int main()
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{
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int n;
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while (~scanf("%d", &n))
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{
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printf("%d\n", get_phi(get_phi(n)));
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}
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return 0;
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}
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