# include<stdio.h> # include<iostream> using namespace std; bool runnian(int x) { if(x%400==0||(x%100!=0&&x%4==0)) return true; else return false; } int main(){ int x,y,cnt=0; cin>>x>>y; for(int i=x;i<=y;i++) { if(runnian(i)) cnt++; } cout<<cnt; return 0; }