#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
An if-else construct implements branching.
Below, if  x < 0 is true, the first branch executes,
outputting "Negative".
Else, the second branch executes,
outputting "Non-negative".

General form:
if [condexpr]:
   [substatements]
elif [condexpr]:
   [substatements]
else:
   [substatements]
"""

x: int = int(input())

if x < 0:
    print("Negative")
else:
    print("Non-negative")