#include<iostream> using namespace std; int getsum(int a,int b){ int sum=0; for(int i=a;i<=b;i++){ if(i%400==0 || (i%4==0 and i%100!=0)){ sum++; } } return sum; } int main() { int a,b; cin>>a>>b; cout<<getsum(a,b); return 0; }