a:array[1..20001] of longint;
i,j,k,n:longint;
begin
read(n);
for i:=1 to n do
read(a[i]);
for i:=1 to n-1 do
for j:=i+1 to n do
if a[i]>a[j] then k:=k+1;
write(k);
end.
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