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#PHP, 60 bytes
[,$h,$v,$d]=$argv;echo$h>$v?$v>$d?ceil(($h-$d)/($v-$d)):N:1;
prints N for None. Run with -r.
N
None
-r
#PHP, 5260 bytes
[,$h,$v,$d]=$argv;echo$v>$d$d]=$argv;echo$h>$v?$v>$d?ceil(($h-$d)/($v-$d)):N;N:1;
#PHP, 52 bytes
[,$h,$v,$d]=$argv;echo$v>$d?ceil(($h-$d)/($v-$d)):N;
