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

unsigned long long expoModulo(unsigned long long a, unsigned long long b, unsigned long long modulo){
    if(b==0) return 1;
    unsigned long long temp=expoModulo(a,b/2,modulo)%modulo;
    if(b%2)
        return (((a*temp)%modulo)*temp)%modulo;
    return (temp*temp)%modulo;
}

int main() {
    unsigned long long a,b;
    unsigned long long t,j,i,modulo;
    unsigned long long resultat;

    scanf("%llu %llu %llu",&a,&b,&t);
    if(t==0){
        printf("0");
        return 0;
    }
    unsigned long long mul=(a+b)/2;

    if (!mul){
        printf("0");
        return 0;
    }

    resultat=expoModulo(mul,t,1000000007);
    printf("%llu",resultat);
    return 0;
}