if __name__ == '__main__':
n = int(input())
x = input().split()
li = [int(i) for i in x]
m = max(li)
k = 0
for i in li:
k += m-i
print(k)#include<bits/stdc++.h>
using namespace std;
int main(){
int t;
cin >> t;
vector<int>inp(t);
for(int i = 0;i < t; i++)
{
cin >> inp[i];
}
sort(inp.begin(), inp.end());
int lar = inp[t-1];
int ans = 0;
for(int i = 0;i < t; i++)
{
ans += (lar-inp[i]);
}
cout<<ans<<endl;
return 0;
}1288A - Deadline | 1617A - Forbidden Subsequence |
914A - Perfect Squares | 873D - Merge Sort |
1251A - Broken Keyboard | 463B - Caisa and Pylons |
584A - Olesya and Rodion | 799A - Carrot Cakes |
1569B - Chess Tournament | 1047B - Cover Points |
1381B - Unmerge | 1256A - Payment Without Change |
908B - New Year and Buggy Bot | 979A - Pizza Pizza Pizza |
731A - Night at the Museum | 742A - Arpa’s hard exam and Mehrdad’s naive cheat |
1492A - Three swimmers | 1360E - Polygon |
1517D - Explorer Space | 1230B - Ania and Minimizing |
1201A - Important Exam | 676A - Nicholas and Permutation |
431A - Black Square | 474B - Worms |
987B - High School Become Human | 1223A - CME |
1658B - Marin and Anti-coprime Permutation | 14B - Young Photographer |
143A - Help Vasilisa the Wise 2 | 320A - Magic Numbers |