#include<bits/stdc++.h> using namespace std; int main(){ int a,b,n,sum=0; cin>>a>>b; for(int i=a;i<=b;i++){ if(a<6){ sum=sum+250; }else if(a>=6){ sum=sum+0; }else if(a>7)a=1; } cout<<sum<<endl; return 0; }