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public class Solution {
    public boolean canWinNim(int n) {
        if (n <= 3) return true;
        return !canWinNim(n - 1) || !canWinNim(n - 2) || !canWinNim(n - 3);
    }
}

public class Solution {
    public boolean canWinNim(int n) {
       return n % 4 != 0;
    }
}