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#include<stdio.h>

int main()

{

int a,i,k,y;

while(~scanf("%d",&a))

{

a=abs(a);

k=0;

for(i=1,y=0;y!=1;i++)

{

k=k+i;

if(k==a)

{

printf("%d\n",i);

break;

}

if(k>a)

{

if((k-a)%2==0)

{

printf("%d\n",i);

break;

}

}

}

}

return 0;

}

/**************************************************************

Problem: 1004

User: 201644901023

Language: C

Result: 正確

Time:0 ms

Memory:1116 kb

****************************************************************/