#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#define mod 1000000007
long int power(int x, unsigned long long int y)
{
    long int temp,temp2,temp3;
    if( y == 0)
        return 1;
    temp = power(x, y/2);
    temp2 = ((temp%mod) * (temp %mod))%mod;
    if (y%2 == 0)
        return temp2;
    else{
        temp3 = ((x%mod) * (temp2 %mod))%mod;
        return temp3;
    }
}
int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    unsigned long long int t,i,cs;
    int a,b;
    scanf("%d%d%llu",&a,&b,&t);
    int r;
    r = (a+b)/2;
    /*for(i = 1; i <= t; i++){
        cs = ((cs % mod)*(r%mod))%mod;
    }*/
    cs = power(r,t);
    printf("%llu\n",cs);
    return 0;
}