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def even(x: Int) : Boolean =
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toInt(toChar(x * 128)) == 0;
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def pow(x: Int, y: Int): Int =
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if (y == 0) 1
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else if (even(y)) {
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val t = pow(x, y / 2);
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t*t
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} else {
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x * pow(x, y - 1)
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};
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var i = 30; var res = 0;
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while(i > 0) {
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res = res + pow(2, i);
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i = i - 1; ()
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};
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res
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