"""
[4696: St. Ives](https://www.acmicpc.net/problem/4696)
Tier: Bronze 4
Category: 구현
"""
def solution():
while 1:
a = float(input())
if a == 0:
break
print('%.2f' % (1 + a + a ** 2 + a ** 3 + a ** 4))
if __name__ == '__main__':
solution()