tzh 2010-08-01 07:32:00
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晒程序ing
tzh神牛的程序（欠抽。。。哈哈）
program t274;
var
n,b,c:longint;
t:int64;
begin
t:=1;
read(n);
for b:=1 to n do
begin
t:=t*b;
while (t mod 10 =0) do t:=t div 10;
if t>100000000000 then t:=t mod 10000000000;
end;
c:=t mod 10;
write(c);
end.