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

long long power(int b,long long n)
{   
   
    if(n==0)
    return 1;
  
	if(n%2==0)
	return (power(b,n/2)%1000000007*((power(b,n/2)%1000000007)%1000000007));
	
	else
	return (power(b,n-1)%1000000007*((b%1000000007)%1000000007));
	
}
 


int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
    int a,b,k;
    long long t;
    
    scanf("%d%d%lld",&a,&b,&t);

    k=0.5*(a+b);
    
    
    printf("%lld",power(k,t)%1000000007);
    return 0;
}