let(@),n=String.make,read_int()/3open Printf;;for i=1to n do
printf"%*s%*s
"(n-i+2)"/"(i*2-1)"\\"done;printf"/%s\\
"(n*2@'_');for i=1to n do
printf"|%*s%*s%*s
"i"\\"(n*2-i*2+1)"/"i"|"done;for i=0to n-2do
printf"|%*s%*s%*s
"(n-i)"/"(i*2+1)"\\"(n-i)"|"done;printf"|/%s\\|"(n*2-2@'_')