#include<stdio.h>
int main(){
	int a[10],i;
	for(i=0;i<10;i++){
		scanf("%d",&a[i]);
	}
	int h,ct=0;
	scanf("%d",&h);
	for(i=0;i<10;i++){
		if(h+30>=a[i]){
			ct++;
		}
	}
	printf("%d",ct);
	return 0;
}

/**************************************************************
	Problem: 1388
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/