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#include <bits/stdc++.h>

#include <iostream>

using namespace std;

int main(){

//program to find trapped water in array in heights of buildings are arr[i].

int n;

cin>>n;

int arr[n];

for(int i=0;i<n;i++){

cin>>arr[i];

}

int ans = 0;

int l[n];

int r[n];

int m = INT_MIN;

for(int i=0;i<n;i++){

l[i] = max(m, arr[i]);

}

m = INT_MIN;

for(int i=n-1;i>=0;i--){

r[i] = max(m, arr[i]);

}

for(int i=0;i<n;i++){

ans += min(l[i], r[i]) - arr[i];

}

cout<<ans<<endl;

return 0;

}