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var p,i,j:longint;
f,g:text;
begin
assign(f,'fact.in');
reset(f);
read(f,p); i:=1;
if p=0 then i:=1
else
repeat
i:=i+10;
if i mod 5=0 then j:=j+1;
if i mod 100=50 then j:=j+2;
if i mod 100=0 then j:=j+2;
if i mod 1000 =500 then j:=j+3;
if i mod 1000=0 then j:=j+3;
if i mod 10000=5000 then j:=j+4;
if i mod 10000=0 then j:=j+4;
until i<=p;
close(f);
assign(f,'fact.out'); rewrite(f);
write (f,j);
close(f);
end.