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

/* Function to calculate x raised to the power y in O(logn)*/
unsigned long power(unsigned long x, unsigned long y)
{
    unsigned long temp;
    unsigned long d = 1000000007;
    if( y == 0)
        return 1;
    temp = power(x, y/2);
    if (y%2 == 0)
        return temp*temp % 1000000007;
    else
        return x*(temp*temp % 1000000007)% 1000000007;
}

int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    unsigned long a;
    unsigned long b;
    unsigned long t;
    unsigned long v;
    unsigned long r;
    scanf("%ld %ld %ld", &a, &b, &t);
    //printf("%ld", t);
    v=(0.5*a + 0.5*b);
    r = power(v, t);
    printf("%ld", r);
    return 0;
}