Acwing 89

#include <iostream>

using namespace std;

int main()
{
    int a, b, p;
    cin >> a >> b >> p;

    int ans = 1 % p;
    for(; b; b>>=1)
    {
        if(b & 1) ans = (long long) ans * a % p;
        a = (long long) a * a % p;
    }
    cout << ans << endl;;
}