RT

#include<bits/stdc++.h>
#define ll unsigned long long
using namespace std;
int n,m,k,a[100000001];
int main(){
	scanf("%lld%lld%lld",&n,&m,&k);
	a[1]=n;
	a[2]=m;
	for(int i=3;i<=k;i++){
		a[i]=a[i-1]*a[i-2];
		a[i]%=10;
	} 
	printf("%lld",a[k]);
    return 0;   
}