#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int n(int x,int y){ int s = 0; for(int i = x;i <= y;i++){ if(i % 4 == 0 && i % 100 != 0 || i % 400 == 0){ s += 1; } } return s; } int main(){ int x,y; cin>>x>>y; cout<<n(x,y); return 0; }