#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mod 1000000007
ll power(ll a,ll b)
    {
    if(b==0)
        return 1;
    ll temp=power(a,b/2);
    temp=(temp*temp)%mod;
    if(b&1)
        temp=(temp*a)%mod;
    return temp;
}
int main() {
   ll t,a,b;
    cin>>a>>b>>t;
    cout<<power((a+b)/2,t)<<endl;
    return 0;
}