int da[50001];
int main()
{
	int i,j,m,n,p;
	while (scanf("%d",&n)!=EOF) {
		for (i=1;i<=n;i++) scanf("%d",&da[i]);
		for (i=1,m=-1;i+m<n;i++) { //加了"+m"二个字符,汗..
			p=i;
			for (j=i+1;j<=n;j++) 
				if (da[j]<da[i]) break;
				else if (da[j]>da[p]) p=j; 
				if (p-i>m) m=p-i;
		}
		if (m==0) m=-1;
		printf("%d\n",m);
	}
}