#include <stdio.h>  
int main ()  
{  
	int height_1,height_2,a[10];  
	int i=0;   
	int count=0;  
	for (i=0;i<10;i++)  
	{    
	   scanf("%d\ ",&height_1);  
	   a[i]=height_1;  
	}  
	printf("\n");  
	scanf("%d",&height_2);  
	for (i=0;i<10;i++)  
	{  
	   if(height_2+30>=a[i])  
		count+=1;  
	   else  
		count=count;  
	}  
	printf("%d",count);  
  	return 0; 
}