[n ,k] = [int(x) for x in input().split()]
if n >= k:
    ans = 2 * n // k
    if 2*n%k > 0:
        ans += 1
    print(ans)
else:
    print(2)

and

[n ,k] = [int(x) for x in input().split()]
if n >= k:
    ans = 2 * n // k
    if 2*n%k > 1:
        ans += 1
    print(ans)
else:
    print(2)

Both is accepted. But second is worng. Need test: 5 3