#include<bits/stdc++.h> using namespace std; bool isrummian(int year){ if(year%4==0&&year%100!==0||year%400){ retrun true; }else{ retrun false; } } int main(){ int x,y,sun=0; cin>>x>>y; for(int i=x;i<=y;i++){ if(isrunnian(i)){ sum++; } } }