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

unsigned long long power(unsigned long long x, unsigned long long t){
    
    if(t==0){
        return 1;
    }
    else if(t==1){
        return x%(1000000007);
    } 
    else if(t%2==0){
        
        return power((x*x)%(1000000007), t/2)%(1000000007);
    }
    else if(t%2==1){
        
        return (x*power((x*x)%(1000000007), (t-1)/2))%(1000000007);
    }
    return 0;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int a, b;
    unsigned long long t, c;
    cin >> a >> b >> t;
    
    c = power((a+b)/2, t)%1000000007;
    
    cout << c;
    
    return 0;
}