#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 main(){ int week,n,km=0; cin>>week>>n; while(n!=0){ if(week>5){ week=1; n-=2; } else{ km+=250; n-=1; week+=1; } } cout<<km<<endl; return 0; }