#include<stdio.h>

int main(){
	int n, m, i, j, count=0;
	scanf("%d %d", &n, &m);
	int h[n], a[m], b[m], counter[n], no[n];
	for(i=0; i<n; i++){
		scanf("%d", &h[i]);
		counter[i]=0;
		no[i]=0;
	}
	for(i=0; i<m; i++){
		scanf("%d %d", &a[i], &b[i]);
		no[a[i]-1]=1;
		no[b[i]-1]=1;
	}
	for(i=0; i<m; i++){
		if(h[a[i]]>h[b[i]]){
			counter[a[i]-1]=1;
			counter[b[i]-1]=0;
		}else if(h[a[i]]<h[b[i]]){
			counter[b[i]-1]=1;
			counter[a[i]-1]=0;
		}
	}
	for(i=0; i<n; i++){
		if(counter[i]==1&&no[i]==0){
			count++;
		}
	}
	printf("%d", count);

	return 0;
}