#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

uint64_t power(uint64_t x, uint64_t y)
{
    uint64_t temp;
    if( y == 0)
        return 1;
    temp = (power(x, y/2))%1000000007;
    if (y%2 == 0)
        return (temp*temp)%1000000007;
    else
        return ((x%1000000007)*((temp*temp)%1000000007))%1000000007;
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    uint64_t a,b,t,ans;
    cin>>a>>b>>t;
    ans=power(0.5*(a+b),t);
    cout<<ans;
    return 0;
}