using System;
public class Test
{
public static void Main()
{
int i = 20;
while (i % 2 != 0 || i % 3 != 0 || i % 4 != 0 || i % 5 != 0 ||
i % 6 != 0 || i % 7 != 0 || i % 8 != 0 || i % 9 != 0 ||
i % 10 != 0 || i % 11 != 0 || i % 12 != 0 || i % 13 != 0 ||
i % 14 != 0 || i % 15 != 0 || i % 16 != 0 || i % 17 != 0 ||
i % 18 != 0 || i % 19 != 0 || i % 20 != 0) {
i += 20;
}
}
}
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