my$N=get;
my ($a,$b,$c)=split(' ',get);
say +$N div+$a+ +$N div+$b+ +$N div+$c
	-+$N div($a lcm$b)-+$N div($b lcm$c)-+$N div($c lcm$a)
	+ +$N div($a lcm$b lcm$c)