#include<iostream>
#include<cstring>
#include<cstdio>
#define LL long long
using namespace std;
LL a,b,p;
LL mull(LL a,LL b,LL p)
{
	LL res=0;
	while(b)
	{
		if(b&1)res=(res+a)%p;
		a=(a+a)%p;
		b=b>>1;
	}
	return res;
}
signed main()
{
	cin>>a>>b>>p;
	LL ans=mull(a,b,p);
	cout<<ans<<endl;
}