#include <stdio.h>
#include <iostream>

using namespace std;

#define MOD 1000000007
 
long long int power (long long int a, long long int b) {
    long long int ans=1ll;
    while(b) {
        if(b&1)ans=(ans*a)%MOD;
        a=(a*a)%MOD;
        b=b/2;
    }
    return ans;
    }
 
int main() {
	int a,b;
	unsigned long long int t;
	cin >> a >> b >> t;
	unsigned long long int ans = (0.5*(a+b));
	cout << power(ans, t) << endl;
}