def N(x):
    n = ""
    if not x:
        return 0
    while x > 0:
        a = str(x % 16)
        n = c[a] + n
        x = x // 16
    return n

c= {'0': '0', '1':'1', '2':'2', '3':'3', '4':'4', '5':'5', '6':'6', '7':'7', '8':'8', '9':'9', '10':'A', '11':'B', '12':'C', '13':'D', '14':'E', '15':'F'}
b = int(input())
if b >= 0:
    print(N(b))
else:
    print('-', N(-b), sep ="")