/*
TASK: psort
LANG: C
*/
#include<stdio.h>

#define MAXN 65536
#define INF 1000000000

int a[MAXN],d[MAXN];

int main()
{
	int i,l,r,mid,res,n,br;
	scanf("%d",&n);
	for(i=1;i<=n;i++) scanf("%d",&a[i]);
	d[1]=a[1]; br=1; d[br+1]=INF;
	for(i=2;i<=n;i++)
	{
		l=1; r=br+1; res=br+1;
		while(l<=r)
		{
			mid=(l+r)/2;
			if(a[i]<d[mid]) { res=mid; r=mid-1; }
			else l=mid+1;
		}
		d[res]=a[i];
		if(res==br+1) { br++; d[br+1]=INF; }
	}
	printf("%d\n",n-br);
	return 0;
}
