# n=int(input())
# a=0
# for i in range(1,n+1):
# for j in range(i+1):
# a=j+a
# print(a)
# k=int(input())
# for i in range(1,7):
# for j in range(1,7):
# if i+j==k:
# print(i,j)# n=int(input())
# a=0
# for i in range(1,n+1):
# for j in range(i+1):
# a=j+a
# print(a)
# k=int(input())
# for i in range(1,7):
# for j in range(1,7):
# if i+j==k:
# print(i,j)