纳米猫猫(欧拉函数)

#include <bits/stdc++.h>
using namespace std;
using ll = long long ;
ll euler(ll n){
    ll k=n;
    for(ll i=2;i*i<=n;i++)
        if(n%i==0){
            k-=k/i;
            while(n%i==0)n/=i;
        }
    if(n>1)k-=k/n;
    return k;
}
ll mi(ll a,ll b,ll mod){
    ll r=1;
    while(b){
        if(1&b)r=r*a%mod;
        a=a*a%mod;
        b>>=1;
    }
    return r;
}
int main()
{
    ios::sync_with_stdio(false);
    string n;
    ll x,mod;
    cin>>x>>n>>mod;
    ll mod1=euler(mod);
    ll r=0;
    for(auto t:n) r=(r*10+t-‘0‘)%mod1;
    r=(r+mod1-1)%mod1;
    cout<<mi(x,r,mod)%mod;
}