#include <iostream> using namespace std; bool flag(long long year) { int flag; if(((year%4==0)&&(year%100!=0))||(year%400==0)) { flag=1; } else { flag=0; } return flag; } int main() { int year1,year2,sum=0; cin>>year1>>year2; for(int i=year1;i<=year2;i++) { sum+=flag(i); } cout<<sum; return 0; }