//Author: Koppu
#include <stdio.h>
#include <stdlib.h>

long int power(long x, long y)
{
    long res = 1;
	long p = 1000000000 + 7;
    x = x % p;
    while (y > 0)
    {
        if (y & 1)
            res = (res*x) % p;

        y = y/2;
        x = (x*x) % p;
    }
    return res;
}

long int total_virus(int a, int b, long t) {
	long res;
	long sum;
	sum = 0.5 * (a + b);
	res = power(sum, t);
	return res;
}

int main(void) {
	int a;
	scanf("%d", &a);
	int b;
	scanf("%d", &b);
	long t;
	scanf("%ld", &t);
	printf("%ld", total_virus(a, b, t));
	return 0;
}