#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
long long int power(long long int a,long long int b)
{
    long long int ans=1;
    while(b)
        {
        if(b&1)
            ans=(ans*a)%1000000007;
        a=(a*a)%1000000007;
        b=b/2;
    }
    return ans;
}

int main() 
{
     int a,b;
    scanf("%d""%d",&a,&b);
    long long int t,i,q=1;
    scanf("%lld",&t);
   long long  int p=0.5*(a+b);

    printf("%lld",power(p,t));

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    return 0;
}