#include<bits/stdc++.h>
using namespace std;
#define int long long
vector<vector<pair<int ,int>>> g;
signed main(){
int n ,m;
cin>>n>>m;
vector<int> a(n + 1);
for(int i =1;i<=n;i++)cin>>a[i];
int idx =0, alt = 0 , ans = 0;
for(int i = 1 ; i<=n;i++){
if(a[i] > alt){
ans += (i - idx);
ans += max(0LL , abs(a[i] - a[idx]));
idx = i;
}
}
cout<<ans;
}
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