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

#define MOD (int)1e9+7

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    long long a,b,t,growth,ans;
    cin>>a>>b>>t;
    growth=(a+b)/2;
    ans=1;
    long long curmul=1;
    long long curgrow=growth;
    while(t){
        t-=curmul;
        ans*=curgrow;
        ans%=MOD;
        curgrow*=curgrow;
        curgrow%=MOD;
        curmul*=2;
        if(curmul>t){
            curmul=1;
            curgrow=growth;
        }
    }
    cout<<ans<<endl;
    return 0;
}