var a:array [1..2000000] of shortint;
    n,k,d,i:integer;
    f,g:text;
begin
assign(f,'ciur.in');
reset(f);
readln(f,n);
close(f);
d:=0;
for i:=1 to n do
    a[i]:=1;

    k:=4;
    repeat
    a[k]:=0;
    k:=k+2;
    until k>n;

    k:=6;
    repeat
    a[k]:=0;
    k:=k+3;
    until k>n;

    k:=10;
    repeat
    a[k]:=0;
    k:=k+5;
    until k>n;

    k:=14;
    repeat
    a[k]:=0;
    k:=k+7;
    until k>n;

for i:=2 to n do
    if a[i]=1 then inc(d);
assign(f,'ciur.out');
rewrite(f);
writeln(f,d);
close(f);
end.