#include<iostream>
using namespace std;

long power(long x, long y, long p)
{
    int res = 1;
 
    x = x % p;
 
    while (y > 0)
    {
        if (y & 1)
            res = (res*x) % p;
 
        y = y>>1;
        x = (x*x) % p;  
    }
    return res;
}

int main() {
    long a, b, t;
    cin >> a >> b >> t;
    long value = (long)((a + b) / (long)2);
    long output = power(value, t, 1000000007);
    cout << output;
    return 0;
}