part1
1  .
1,   .
1       .
1 .   .  .

1...
1    .
1      .  .
3 - .
3 - 5.
3 / - 0.
end
part2
1,          ..
1    .    .
end
part3
1 
1 
1 
end
part4
1 
1 
1 
end
