#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define MOD 1000000007

long long modex(long long base,long long expo){
    
    if(expo==0)
       return 1;
    
    long long f=modex(base,expo/2);
    
    if(expo%2==0)
        return (f%MOD*f%MOD)%MOD;
    return ((f%MOD*f%MOD)%MOD*base%MOD)%MOD;
    
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    long long a,b,t;
    cin>>a>>b>>t;
    
    long long res1=modex(a+b,t);
    long long res2=modex(modex(2,t),MOD-2);
    
    long long res3=(res1%MOD*res2%MOD)%MOD;
    
    cout<<res3<<"\n";  
    
    return 0;
}