#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
ios::sync_with_stdio(0);
cin.tie(nullptr); cout.tie(nullptr);
int n, ans = 0;
cin >> n;
vector<int> a(n + 1, 0);
for(int i = 1; i <= n; ++i) cin >> a[i];
for(int i = 1; i <= n; ++i){
if(a[i] == 0) continue;
int end_point = i;
for(int j = i; j <= n; ++j){
if(a[j] < a[i]) break;
end_point = j;
}
for(int j = i + 1; j <= end_point; ++j){
a[j] -= a[i];
}
ans += 1;
}
cout << ans << "\n";
return 0;
}
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