#include<bits/stdc++.h> using namespace std; int n=0,x=0,a,km; int main(){ cin>>x>>n; n+=x-1; a=n%7; if(a==0){ km=(n/7*5)*250-(x-1)*250; } else if(a<=5){ km=(n/7*5)*250-(x-1)*250+a*250; } else{ km=(n/7*5)*250-(x-1)*250+5*250; } cout<<km; return 0; }