#include<bits/stdc++.h>
using namespace std;
long long a,b,c;
long long nhan(long long a, long long b, long long c)
{
if(b==0ll) return 0ll;
long long t = nhan(a,b/2,c);
if(b%2==0)
{
return (t+t)%c;
}
else
{
return ((t+t)%c + a%c)%c;
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> a >> b >> c;
cout << nhan(a,b,c);
}
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