221217

# while True:
#     a=input()
#     print(a)
#     if a=='q':
#         break
# a=int(input())
# s=0
# for i in range(a):
#     s+=i
#     if s>=a:
#         print(i)
#         break
# n,m=map(int,input().split(' '))
# for i in range(1,n+1):
#     for j in range(1,m+1):
#         print(i,j)
# a=input()
# n=int(a,16)
# for i in range(1,16):
#     print('%X' % n, '*%X' % i, '=%X' % (n * i), sep='')
# a=int(input())
# for i in range(1,a+1):
#     if i%10==3 or i%10==6 or i%10==9:
#         print("X",end=' ')
#     else:
#         print(i, end=' ')
# r,g,b=map(int,input().split(' '))
# for i in range(0,r):
#     for j in range(0,g):
#         for k in range(0,b):
#             print(i,j,k)
# # print(r*g*b)
# h,b,c,s=map(int,input().split(' '))
# s=((h*b*c*s)/8/1024/1024)
# print("%.1f MB" %s)
# w,h,b=map(int,input().split(' '))
# s=((w*h*b)/8/1024/1024)
# print("%.2f MB" %s)
# n=int(input())
# s=0
# c=0
# while True:
#     s+=c
#     c+=1
#     if s>=n :
#         break
# print(s)
# n=int(input())
# for i in range(1, n+1) :
#   if i%3==0 :
#     continue
#   else:
#     print(i, end=' ')