#include<iostream>
using namespace std;
int main()
{
int T;
while(T)
{
int N;
cin>>N;
int a[N];
for(int i1=0;i1<N;i1++)
{
cin>>a[i1];
}
int p,s=0;
for(int i=0;i<N-1;i++)
{
if(a[i]>=a[i+1])
{
s=s+1;
}
else
{
p=a[i];
a[i+1]=p;
}
}
cout<<s<<endl;
T--;
}
}
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