Program tam_giac;
uses crt;
var A:array[1..1000] of integer;
n,i,j,k,d:integer;
begin
clrscr;
write('Nhap so luong: '); readln(n);
for i:=1 to n do
begin
write('Nhap so thu ',i,': '); readln(A[i]);
end;
d:=0;
for i:=1 to n-2 do
for j:=i+1 to n-1 do
for k:=j+1 to n do
if (A[i]<A[j]+A[k]) and (A[j]<A[i]+A[k]) and (A[k]<A[i]+A[j]) then d:=d+1;
write(d);
readln;
end.