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

unsigned long long getCellNumber(int a, int b, unsigned long long t) {
    unsigned long long cellNumber = 1;
    
    const int MOD = 1000000007;
    unsigned long long  growthPerMillisecond = (a + b) / 2;
    growthPerMillisecond = growthPerMillisecond % MOD;
    
    while (t > 0) {
        if (t & 1) {
           cellNumber = (growthPerMillisecond * cellNumber) % MOD;
        }
        t = t >> 1;
        growthPerMillisecond = (growthPerMillisecond * growthPerMillisecond) % MOD;
        
    }
    
    return cellNumber;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int a, b;
    unsigned long long t;
    cin >> a >> b >> t;
    
    cout << getCellNumber(a, b, t) << endl;
    
    return 0;
}