#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define mod 1000000007
#define ll long long
ll p(ll a,ll b)
    {
    if(b==0)
        return 1;
    ll temp;
    temp=p(a,b/2)%mod;
    if(b&1)
        {
        return (((a*temp)%mod)*temp)%mod;
    }
    else
         return (((temp)%mod)*temp)%mod;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int a,b;
    ll t;
    scanf("%d %d %lld",&a,&b,&t);
   ll ans=p((((a+b)*0.5)),t)%mod;
    printf("%lld\n",ans);
    return 0;
}