#include<bits/stdc++.h>
using namespace std;
int main() {
int N, maxn=0;
cin >> N;
int arr[N];
for(int i=0;i<N;i++) {
cin >> arr[i];
if(arr[i]>maxn){
maxn=arr[i];
}
}
int acc=0;
for(int i=0;i<N;i++){
acc+=abs(maxn - arr[i]);
}
cout << acc << endl;
}
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