n=int(input())
for i in range(0,n):
for j in range(1,n+1):
print(" ",end="")
print("@")
for i in range(1,n+1):
for j in range(i,n+1):
print(" ",end="")
for j in range(0,2*i-1):
print("@",end="")
print()
for i in range(n-1,0,-1):
for j in range(0,n-i+1):
print(" ",end="")
for j in range(0,2*i-1):
print("@",end="")
print()
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