#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define l long
#define fr(i,n) for(int i=0;i<int (n);i++)
#define pf printf
#define sf scanf
#define M 1000000007
ll bond(int n,ll m)
{
    if(m==0)return 1;
    ll p=bond(n,m/2);
    if(m%2==0)return ((p%M)*(p%M))%M;
    else
        return ((((p%M)*(p%M))%M)*n)%M;
}
int main()
{
    int a,b;
    ll t;
    sf("%d%d%lld",&a,&b,&t);
    int x=(a+b)*.5;
    ll p=bond(x,t);
    pf("%lld",p);
    return 0;
}