#include <stdio.h>
#include <stdlib.h>
void scanf_array(int **array,int num){
	*array = (int *)malloc(num * sizeof(int));
    if (*array == NULL) {
        printf("内存分配失败！");
        exit(1);
    } else {
        for (int i = 0; i < num; i++) {
            scanf("%d", &(*array)[i]);
        }
    }
}


int main(void){
	int *apple_heights;
	int num_apples=10;
	scanf_array(&apple_heights,num_apples);
	int *taotao_height;
	int num_taotao_height=1;
	scanf_array(&taotao_height,num_taotao_height);
	int reachable_apples=0;
	for(int i=0;i<num_apples;i++){
		if(apple_heights[i]<=*taotao_height+30){
			reachable_apples++;
		}
	}
	printf("%d",reachable_apples);
	free(apple_heights);
	free(taotao_height);
	return 0;
}