#include<bits/stdc++.h>
#define int long long
using namespace std;
void solve(){
int n;
cin>>n;
vector<int>a(n);
for(int i=0;i<n;i++){
cin>>a[i];
}
int cnt=0,now=a[0];
for(int i=1;i<n;i++){
if(now<a[i]){
cnt++;
}
now=a[i];
}
cout<<cnt;
}
signed main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t;
t=1;
// cin>>t;
while(t--){
solve();
}
return 0;
}
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