#include<stdio.h>
int main()
{
    int x,n,m;
    scanf("%d %d",&x,&n);
    if (x < 6)
        {
            if ((x + n) / 7 < 1)//未满一周
            {
                if (x + n >= 5)
                    m = (5 - x + 1) * 250;
                else
                    m = (n + 1) * 250;
            }
            else
            {
                if ((x + n) % 7 < 6)//未到周末
                    m = ((x + n) / 7 - 1) * 250 * 5 + (x + n) % 7 * 250 + (5 - x + 1) * 250;
                else
                    m = ((x + n) / 7) * 250 * 5 + (5 - x + 1) * 250;
            }
        }
        else//x在周末开始的
        {
            if (x + n <= 7)
                m = 0;
            else
            {
                if ((x + n) % 7 < 6)
                    m = ((x + n) / 7 - 1) * 250 * 5 + (x + n) % 7 * 250;
                else
                    m = ((x + n) / 7) * 250 * 5;
            }

        }
     
    
    printf("%d",m);
    return 0;
}