_==0 "exec" "gawk" "-f" "$0"
function gcd(a,b){ return b!=0?gcd(b,a%b):a }
function lcm(a,b){ return a/gcd(a,b)*b }
function f(n,a,b,c){ return int(n/a)+int(n/b)+int(n/c)-int(n/lcm(a,b))-int(n/lcm(b,c))-int(n/lcm(c,a))+int(n/lcm(lcm(a,b),c)) }
NR==1{ n=$0 }
NR==2{ print f(n,$1,$2,$3) }