#include <stdio.h>
#include <math.h>
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define INF 1<<30;

int N;
int A[1000];
int dp[1000];
_Bool exist[10001];
int cx[1000];

int main() {
	scanf("%d", &N);
	REP(i, N) scanf("%d", &A[i]), exist[A[i]] = 1;
	
	int cxs = 0;
	REP(i, 10001) if (exist[i]) cx[cxs++] = i;
	
	REP(i, cxs) dp[i] = abs(A[0] - cx[i]);
	FOR(i, 1, N) {
		int mn = INF;
		REP(j, cxs) {
			mn = mn > dp[j] ? dp[j] : mn;
			dp[j] = mn + abs(cx[j] - A[i]);
		}
	}
	
	int ans = INF;
	REP(i, cxs) ans = ans > dp[i] ? dp[i] : ans;
	printf("%d\n", ans);
}