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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main(){
  5. int N,A,X,Y,F;
  6. cin>>N>>A>>X>>Y;
  7. F=X*A+Y*(N-A);
  8. cout << F << endl;
  9. }
Success #stdin #stdout 0s 5288KB
stdin
5 3 20 15
stdout
90