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#include <stdio.h>

int main()

{
int num=1;

int k;

int n=1;

double S=0.0;

scanf("%d",&k);

while(int(S)<=k)
{

S=S+(1/n)+(1/n+1);

n+=2;

num++;

}

printf("%d",num*2);

return 0;
}
#include <stdio.h>
<p>
int main()

{
int num=1;

int k;

int n=1;

double S=0.0;

scanf("%d",&k);

while(int(S)<=k)
{

S=S+(1/n)+(1/n+1);

n+=2;

num++;

}

printf("%d",num*2);

return 0;
}