# -*- coding: utf-8 -*-
"""
Created on Fri Jan 15 08:12:12 2021

@author: SIO1
"""

N=int(input("entrez nombre de secondes: "))
nbr=N
for k in range(1,N+1):
    print("Plus que ",nbr," secondes...")
    nbr=nbr-1
    if k == N+1:
        print("Plus qu'1 seconde...")
print("Boooooooooommmmm !!!!!")