20 lines
309 B
C++
20 lines
309 B
C++
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//acmp.ru 0539 tort.cpp 6%
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#include <stdio.h>
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int main(){
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freopen("INPUT.TXT", "r", stdin);
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freopen("OUTPUT.TXT", "w", stdout);
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short N;
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scanf("%hi", &N);
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if (N <= 1){
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printf("0");
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}else if(N % 2 == 0){
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printf("%hi", N / 2);
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}else if(N % 2 != 0){
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printf("%hi", N);
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}else {
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printf("0");
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}
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}
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