#include<bits/stdc++.h> using namespace std; int main(){ long long v,a,b,c,d; cin>>v>>a>>b>>c>>d; if((d-c)==(c-b)&&(c-b)==(b-a)){ cout<<a+(v-1)*(b-a); } else if(d/c==b/a&&c/b==b/a){ cout<<a*pow(d/c,v-1); } return 0; }