#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#define Max(x,y) (x)>(y)?(x):(y)
struct Q
{
    double x, y;
} q[100001], sl[10], sr[10];

int cntl, cntr, lm, rm;

double ans;
int cmp(const void*p1, const void*p2)
{
    struct Q*a1=(struct Q*)p1;
    struct Q*a2=(struct Q*)p2;
    if (a1->x<a2->x)return -1;
    else if (a1->x==a2->x)return 0;
    else return 1;
}
double CalDis(double x1, double y1, double x2, double y2)
{
    return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
}
void MinDis(int l, int r)
{
    if (l==r) return;
    double dis;
    if (l+1==r)
    {
        dis=CalDis(q[l].x,q[l].y,q[r].x,q[r].y);
        if (ans>dis) ans=dis;
        return;
    }
    int mid=(l+r)>>1, i, j;
    MinDis(l,mid);
    MinDis(mid+1,r);
    lm=mid+1-5;
    if (lm<l) lm=l;
    rm=mid+5;
    if (rm>r) rm=r;
    cntl=cntr=0;
    for (i=mid; i>=lm; i--)
    {
        if (q[mid+1].x-q[i].x>=ans)break;
        sl[++cntl]=q[i];
    }
    for (i=mid+1; i<=rm; i++)
    {
        if (q[i].x-q[mid].x>=ans)break;

        sr[++cntr]=q[i];
    }
    for (i=1; i<=cntl; i++)
        for (j=1; j<=cntr; j++)
        {
            dis=CalDis(sl[i].x,sl[i].y,sr[j].x,sr[j].y);
            if (dis<ans) ans=dis;
        }
}
int main()
{
    int n, i;
    while (scanf("%d",&n)==1&&n)
    {
        for (i=1; i<=n; i++)
            scanf("%lf%lf", &q[i].x,&q[i].y);
        qsort(q+1,n,sizeof(struct Q),cmp);
        ans=CalDis(q[1].x,q[1].y,q[2].x,q[2].y);
        MinDis(1,n);
        printf("%.2lf\n",ans/2.0);
    }
    return 0;
}