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import sys
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main() {
x := 0
if x != 0 {
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sys.exit(1)
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}
if x > 0 {
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sys.exit(1)
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}
if x < 0 {
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sys.exit(1)
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}
if 0 != x {
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sys.exit(1)
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}
if 0 > x {
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sys.exit(1)
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}
if 0 < x {
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sys.exit(1)
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}
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if x >= 1 {
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sys.exit(1)
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}
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if 1 <= x {
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sys.exit(1)
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}
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if x + 1 != x + 1 {
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sys.exit(1)
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}
if x + 1 != inc(x) {
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sys.exit(1)
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}
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if x - 1 != dec(x) {
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sys.exit(1)
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}
if inc(x) != x + 1 {
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sys.exit(1)
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}
if dec(x) != x - 1 {
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sys.exit(1)
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}
if x != inc(dec(x)) {
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sys.exit(1)
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}
if inc(dec(x)) != x {
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sys.exit(1)
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}
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if inc(x) == dec(x) {
sys.exit(1)
}
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if x == 0 {
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sys.exit(0)
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}
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sys.exit(1)
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}
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inc(x Int) -> Int {
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return x + 1
}
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dec(x Int) -> Int {
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return x - 1
}