#include<iostream> using namespace std; bool rl(int year){ if(year%4==0&&year%100!=0||year%400==0){ return 1; } else { return 1; } return 0; } int main(){ int x,y,sum=0; cin>>x>>y; for(int i=x;i<=y;i++){ if(rl(i)==1){ sum++; } } cout <<sum; return 0; }