#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {
    long a, b, t;
    scanf("%li %li %li", &a, &b, &t);
    long modulo = pow(10, 9)+7;
    long result = 1;
    long base = (a+b)/2;
    
    while (t > 0) {
        if (t % 2 == 1)
           result = (result * base) % modulo;
        t >>= 1;
        base = (base * base) % modulo;
    }
    printf("%li", result);
    return 0;
}