20250719

# def mmyfind(x,y):
#     global a
#     s=0
#     for j in range(x-1,x+2):
#         for k in range(y-1,y+2):
#             if 9>j>=0 and 9>k>=0 :
#                 s+=a[j][k]
#     return s
# a=[]
# for i in range(9):
#     a.append(list(map(int,input().split())))
# r,c=map(int,input().split())
# r-=1
# c-=1
# if a[r][c]==1 :
#     print('-1')
# else :
#     print(mmyfind(r, c))

# N=int(input())
# a=[]
# for i in range(N):
#     a.append(list(map(int,input().split())))
# for i in range(1,N):                # 행
#     for j in range(1,i+1):          # 열
#         a[i].append(a[i][j-1]-a[i-1][j-1])
# for i in range(N):
#     for j in range(len(a[i])):
#         print(a[i][j],end=' ')
#     print()

# a=[]
# for i in range(10):
#    a.append(list(map(int, input().split())))
# b=list(map(int, input().split()))
# for i in range(10):
#     if b[i]==1 :
#         for j in range(1,11):
#             sum='x'
#             if a[10-j][i]>0 :
#                 sum='crash'
#                 break
#             elif a[10-j][i]<0 :
#                 sum='fall'
#                 break
#             elif a[10-j][i]==0 :
#                 sum='safe'
#         print(i+1,sum,sep=' ')

n=int(input())
b=[]
for i in range(n):
    b.append(list(map(int,input().split())))
d=[]
for i in range(19) :
    d.append([])
    for j in range(19) :
        if :
            d[i].append(1)
        else :
            d[i].append(0)