#include<bits/stdc++.h> using namespace std; int main(){ double a,ans; cin>>a; if(a<=10){ ans=2.5; } else{ ans=2.5+(a-10)*1.5; } printf("%.2f",ans); } /************************************************************** Problem: 1043 User: zhuangsongyu Language: C++ Result: Accepted Time:20 ms Memory:2072 kb ****************************************************************/