#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define MOD 1000000007
using namespace std;

long long int expow(long long int a, long long int b, long long int c) {
        long long int ans=1;
        while(b != 0) {
                if(b%2 == 1)
                        ans=(ans*a)%c;
                a=(a*a)%c;
                b /= 2;
        }
        return ans;
}

int main() {
    long long a,b,t,k,ans;
    cin>>a>>b>>t;
    k=(0.5*(a+b));
    ans=expow(k,t,MOD);
    cout<<ans<<endl;
    return 0;
}