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begin
write('ÊäÈë±ä³¤µÄÌõÊýn');       
readln(n);
[color=#FF0000]s:=n*(n-1)*(n-2)div 6;    //±¾ÐÐÌæ»»Îªs:=n*(n-1)*(n-2)/ 6;Ôõô²»ÐУ¿£¿£¿[/color]
writeln('×é³ÉµÄÈý½ÇÐθöÊý',s);
readln;[/size]
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