#include<bits/stdc++.h> using namespace std; int main() { int t1=0,l1=0,c4=0,a=0; while(a<=1000){ t1++; if(t1==21) t1=1; l1++; if(l1==31) l1=1; if(l1==t1) c4++; a++; } cout<<c4; return 0; }