#include<stdio.h>
int main(){
  int x,n;
  scanf("%d %d",&x,&n);
  if(n==0) printf("0");
  else{
  int m=6-x+2;
  int na = (6-x)*250;
  int me = (n-m)/7;   
  int meme = me*5*250;
  int yuan = ((n-m)%7)*250;
  int gongli = meme + yuan + na;
  printf("%d",gongli);}
  return 0;
}