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

unsigned long long power ( unsigned long long x, unsigned long long y, int p = 1000000007 ) {
    unsigned long long result = 1;
    
    x %= p;
    
    while ( y > 0 ) {
        if ( y & 1 )
            result = (result*x) % p;
        
        y = y >> 1;
        x = (x*x) % p;
    }
    
    return result;
}

int main() {
    unsigned long t;
    int a, b;
    unsigned long long sum = 1;
    
    cin >> a >> b >> t;
    
    sum = power( 0.5*(a+b), t );
    
    cout << sum << endl;
    
    return 0;
}