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lrz_1995 2009-03-08 00:01:00
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快var ci,a,b,i,j,p:longint;

function find(x:longint):longint;

var i,s:longint;

begin

s:=1;

for i:=2 to trunc(sqrt(x)) do

if x mod i=0 then

s:=s+i+x div i;

if trunc(sqrt(x))+trunc(sqrt(x))=x then

dec(s,trunc(sqrt(x)));

find:=s;

end;

begin

read(a,b);

for i:=a to b do

begin

p:=find(i);

if i<p then

if p-i<=100000 then

if i=find(p) then

inc(ci);

end;

writeln(ci);

end.

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