#include<stdio.h>
int main() {
    int apple[10];
    int height;
    int i = 0, success = 0;
    while(i < 10) {
        scanf("%d", &apple[i]);
        i++;
    }
    scanf("%d", &height);
    for(int j = 0; j < 10; j++) {
        if(height+30 >= apple[j]) {
            success += 1;
        }
    }
    printf("%d\n", success);
}