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

long long power(long long x, unsigned long long y, long long p)
{
    long long res = 1;      // Initialize result
 
    x = x % p;  // Update x if it is more than or 
                // equal to p
 
    while (y > 0)
    {
        // If y is odd, multiply x with result
        if (y & 1)
            res = (res*x) % p;
 
        // y must be even now
        y = y>>1; // y = y/2
        x = (x*x) % p;  
    }
    return res;
}

int main() {

    int a,b;
    long long p;
    unsigned long long t;
    scanf("%d %d %lld", &a, &b, &t);

    p=power((a+b)/2,t,1000000007);

    
    

    printf("%lld",p);
    
    return 0;
}