#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define mod 1000000007
using namespace std;

long long powerx(long long A, long long P)
{
	long long ans = 1;
	while(P)
	{
		if(P%2==1)
			ans = (A*ans)%mod;
		A = (A*A)%mod;
		P/=2;
	}
	return ans;
}

int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    long long t, m;
    scanf("%lld", &t);
    m = (a+b)/2;
    cout << powerx(m, t);
    return 0;
}