#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; for(int i=1;i<=n;i++){ if(week<=5)km+=250; if(week>7)week=1; week++; } cout<<km<<endl; return 0; }