#include<bits/stdc++.h> using namespace std; int main(){ int n,s,c; cin>>n; if(n>10){ s=75*5; } else if(n<=10&&n>=7){ s=45*5; } else if(n<=6&&n>=3){ s=15*5; } if(s%120==0){ c=s/120; } else{ c=s/120+1; } cout<<c; return 0; }