622 B | 622 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(n):
l = []
while n > 0:
l.append(n % 2)
n //= 2
while len(l) < 32:
l.append(0)
ret = 0
z = 1
for i in l[::-1]:
ret += i * z
z *= 2
return ret
def solve():
while 1:
n = ii()
if n == -1:
break
p(f(n))
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
solve()