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#include<iostream>
using namespace std;
int main ()
{
    
 float bal;
 int wid ;
 cin>>wid>>bal;
 if (bal>=wid+0.5 && wid%5==0 )
{
    bal=bal-wid-0.5;
    
}    
  
        cout<<bal;
        
    return 0;
}
Success #stdin #stdout 0s 3100KB
stdin
Standard input is empty
stdout
-1.61577