#include <cstdio>
#include <vector>
#include <algorithm>
#define rep(i, a) for (int i = (int)0; i < (int)a; ++i)
template<class T> inline void chmin(T& a, T b) { if (a > b) { a = b; } }
using ll = long long;
using namespace std;

long long in()
{
    long long result = 0;
    while (1) {
        int c = getchar_unlocked();
        if (c < '0' || c > '9') {
            break;
        }
        result = 10 * result + (c - '0');
    }
    return result;
}

char buf[20];
void out(long long n) {
    int i = 0;
    buf[i++] = '0' + (n % 10);
    n /= 10;
    for (; n != 0; i++, n /= 10) {
        buf[i] = '0' + (n % 10);
    }
    while (i != 0) {
        putchar_unlocked(buf[--i]);
    }
    putchar_unlocked('\n');
}

int main()
{
	ll N = in();
	vector<ll> Y(N), a(N);
	rep(i, N) {
		Y[i] = in();
		a[i] = Y[i];
	}
	sort(a.begin(), a.end());
	a.erase(unique(a.begin(), a.end()), a.end());
	vector<ll> dp(a.size(), 0);
	rep(i, N){
		ll t = 1LL << 60;
		rep(j, a.size()){
			chmin(t, dp[j] + abs(Y[i] - a[j]));
			dp[j] = t;
		}
	}
	out(*min_element(dp.begin(), dp.end()));
	return 0;
}