#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
long long int power(int a,long long int n)
     {
    long long int po=1,sum=a,max=1000000000+7;
    while(n)
    {
        if(n&1)
            po=((po%max)*(sum%max))%max;
            sum=((sum%max)*(sum%max))%max;
        n=n>>1;
        //cout << "hello";
    }
    return po%max;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    long long int a,b,t,res=0,val;
    cin>>a>>b>>t;
    val=(a+b)/2;
    printf("%lld", power(val,t));
    //res=(((a*t)/2)%max+((b*t)/2)%max)%max;
    //cout<<res;
    return 0;
}