Codeforces 466A - Cheap Travel solution

  Solution in C++: 

///******Bismillahir-Rahmanir-Rahim******///

///AH Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh 

1. #include <bits/stdc++.h>
2. using namespace std;
3. int main()
4. {
5. int n,m,a,b;
6. cin>>n>>m>>a>>b;
7. if(m*a<=b)
8. cout<<n*a<<endl;
9. else
10. cout<<(n/m)*b+min((n%m)*a,b)<<endl;
11.  
12. }