#include<stdio.h>
#include<iostream>
using namespace std;

__int128 mod = (__int128)(1000000007);
__int128 power(__int128 x, unsigned long long y)
{
    if( y == 0)
        return 1;
    else if (y%2 == 0)
        return ((power(x, y/2)*power(x, y/2))%(mod));
    else
        return ((x*power(x, y/2)*power(x, y/2))%(mod));
 
}
 
int main()
{
    unsigned long long t,a,b;
    cin >> a >> b >> t;
    
    cout << (unsigned long long)power((__int128)(0.5*(a+b)), t);
    return 0;
}