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

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