#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
long long mypow(long long b, long long p) {
    long long r = 1;
    
    while(p) {
        if(p&1) { r *= b; r%=1000000007;}
        
        b *= b;
        b %= 1000000007;
        p >>= 1;
    }
    return r;
}

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 r = mypow((a+b)/2, t);
    cout << r << endl; 
    return 0;
}