#include<bits/stdc++.h> using namespace std; int main(){ int cxs=0; int t=0; while(t<=40){ t++; if(t%1==0&&t<=10){ cxs++; }else if(t%2==0&&t<=20){ cxs++; }else if(t%4==0&&t<=40){ cxs++; } } cout<<cxs; return 0; }