#include <stdio.h>
long long int power(long long int x, long long int y, long long int p)
{
    long long int 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;
}
// Driver program to test above functions
int main()
{
   long long int a,b;
   long long int t;
   long long int answer=0;
   long long int bb,two; 
    scanf("%lld",&a);
   scanf("%lld",&b);
    scanf("%lld",&t);
   long long int m = 1e9+7;
   answer=power((a+b)/2, t,m) ;
    
   printf("%lld", answer);
   return 0;
}