#include <iostream>
#include <cmath>
using namespace std;
int main() {
long long n, burbles = 0, maxEle = -1, citizen;
cin >> n;
for (int i = 0; i < n; i++){
cin >> citizen;
burbles += citizen;
maxEle = max(citizen, maxEle);
}
cout << maxEle * n - burbles;
}
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