#include <stdio.h>
int main()
{
    int x, n, m, y, other, sum;
    scanf("%d %d",&x, &n);
    other = 7 - x + 1;
    m = (n - other) / 7;
    n = (n - other) % 7;
    if (x<=6)
{
    if (y<=5)
        sum = n-2-2*m;
    if (y==6)
        sum = n-3-2*m;
    if (y==7)
        sum = n-4-2*m;
}
    else
{
    if (y<=5)
        sum = n-1-2*m;
    if (y==6)
        sum = n-2-2*m;
    if (y==7)
        sum = n-3-2*m;
}
    printf("%d", sum*250);
    return 0;
}