def triangular(n):
    return (n)*(n+1)//2

def pentagonal(n):
    return n*(3*n-1)//2

def hexagonal(n):
    return n*(2*n-1)

def lint(n):
    if int(n)==n:
        return int(n)
    else:
        return int(n)+1
triangulars=set()
pentagonals=set()
hexagonals=set()

item=input().split()

n=int(item[0])
a=int(item[1])

i=1
if a==3:
    for i in range(1,lint((-1+(8*n)**0.5)/2)):
        y=(1+12*(i)*(i+1))**0.5
        if int(y)==y:
            if (1+int(y)) % 6 == 0:
                print(triangular(i))
   
else:
    for i in range(1,lint((1+(24*n)**0.5)/6)):
        y=(4+16*i*(3*i-1))**0.5
        if int(y)==y:
            if (2+int(y)) % 8 == 0:
                print(pentagonal(i))