#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n; cin>>n;
int a[n]; for(auto&x:a) cin>>x;
if(n<=1000){ // Subtask 1
int ans=0;
for(int i=0;i<n;++i){
if(!a[i]) continue;
++ans;
for(int j=i+1;j<n;++j){
if(a[j]<a[i]) break;
a[j]-=a[i];
}
}
cout<<ans<<'\n';
return 0;
}
int ans=(a[0]>0);
for(int i=1;i<n;++i)
ans+=(a[i]-a[i-1]>0);
cout<<ans<<'\n';
return 0;
}
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