#include <stdio.h>
int sumodd(int n){
if(n%2==1){
if(n/2==0){
return n;
}
else{
return n+sumodd(n-2);
}
}
else{
n--;
if(n%2==0){
if(n/2==0){
return n;
}
else{
return n+sumodd(n-2);
}
}
}
}
int main(){
int a;
return 0;
}
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