#include<bits/stdc++.h> using namespace std; bool isRN(int year) { if(year%4==0 && year%100!=0 || year%400==0) { return 1; } return 0; } int main(){ int x,y,count=0; for(int i=x;i<=y;i++) { if(isRN(i)==1) { count++; } } cout<<count; return 0; }