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

const uint64_t modulo = 1000000007;

uint64_t power(uint64_t x, uint64_t y)
{
    uint64_t res = 1;  
 
    x = x % modulo; 
 
    while (y > 0)
    {
        if (y & 1)
            res = (res*x) % modulo;
 
        y = y>>1; 
        x = (x*x) % modulo;  
    }
    return res;
}

int main() {    
    
    int a, b;
    uint64_t t;
    
    cin >> a >> b >> t;
    int scale = (a+b)/2;
    
    uint64_t result = power(scale, t);
    
    result = result % modulo;
    
    cout << result; 
    return 0;
}