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pass#include <stdio.h>
int main(void)
{
long n,i;
scanf("%ld",&n);
for (i=1;i<=2*n;i++){
if((((i+1)*i)/2-n)%2==0&&(((i+1)*i)/2-n)>0){
printf("%ld\n",i);
break;
}
}
return 0;
}
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