#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 my_sum(int x,int y){ int ans=0; for(int i=x;i<=y;i++){ if(i%4==0&&i%100!=0){ ans+=1; } } return ans; } int main(){ int d,f; cin>>d>>f; if(d-f>f-d) cout<<my_sum(f,d)<<endl; if(d-f<f-d) cout<<my_sum(d,f)<<endl; return 0; }