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A simple Java solution:
public static void decentNumber(int n) { int numOfFives = n; while (numOfFives % 3 != 0) { numOfFives = numOfFives - 5; } if (numOfFives < 0) { System.out.println("-1"); } else { System.out.println("5".repeat(numOfFives) + "3".repeat(n - numOfFives)); } }
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Sherlock and The Beast
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A simple Java solution: