55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
#include<cstdio>
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#include<cstring>
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#include<cmath>
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#include<iostream>
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#include<string>
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#include<vector>
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#include<map>
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#include<algorithm>
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#include<queue>
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using namespace std;
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#define MP make_pair
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#define PB push_back
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#define foreach(e,x) for(__typedef(x.begin()) e=x.begin(); e!=x.end(); ++e)
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typedef long long LL;
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typedef vector<int> VI;
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typedef pair<int, int> mapII;
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const int MAX_N = 1000000 + 10;
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const double PI = acos(-1.);
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const double EPS = 1e-8;
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int N;
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int a[MAX_N];
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void read(int &x)
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{
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x = 0;
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char ch;
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for( ; ch = getchar(); ) {
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if (isdigit(ch)) break;
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}
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x = ch - '0';
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for( ; ; ) {
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ch = getchar();
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if (! isdigit(ch)) break;
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x = x * 10 + ch - '0';
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}
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}
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void solve()
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{
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for(int i = 1; i <= N; ++ i) a[i] = i;
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int u;
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for(int i = 1; i <= N; ++ i) {
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read(u);
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a[u] = a[i];
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}
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int ret = 0;
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for(int i = 1; i <= N; ++ i)
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ret += a[i] == a[1];
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printf("%d\n", ret - 1);
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}
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int main()
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{
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for( ; cin >> N; )
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solve();
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return 0;
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}
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