Excursie0

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int z,pb,b,pt,t;
    cin>>z>>pb>>b>>pt>>t;
    for(int i=1;i<=z;i++)
    {
        pb+=b;
        pt+=t;
        if(pb==pt)
        {
            cout<<pb;
            return 0;
        }
    }
    cout<<-1;
}