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import java.util.*;

public class Main {
public static void main(String{{^^%5B%5D^^}} args) {
Scanner sc = new Scanner(System.in);

int n = sc.nextInt();
int{{^^%5B%5D^^}} arr = new int[n];

for (int i = 0; i < n; i++) {
arr[i] = sc.nextInt();
}

HashMap<Integer, Integer> freq = new HashMap<>();

for (int num : arr) {
freq.put(num, freq.getOrDefault(num, 0) + 1);
}

HashSet<Integer> set = new HashSet<>(freq.values());

if (set.size() == freq.size()) {
System.out.println("true");
} else {
System.out.println("false");
}
}
}