import java.util.Scanner;

class Feb11 {

	public static void main(String[] args) {

		Scanner kb = new Scanner(System.in);

/*
		int count = 0;
		while(true) {
			System.out.println("please enter an integer");
			int number = kb.nextInt();
		
			if (number == 0) {
				break;
			}

			if(number % 5 == 0) {
				count++;
			}

		}
		System.out.println("count: " + count);

		count = 0;

		for(int i = 1; i <= 1000; i++) {
			if (i % 21 == 0) {
				count++;
			}
		}
		System.out.println("count: " + count);

		int number = 100;
		while (number >= 10) {
			System.out.print(number + " ");
			number--;
		}	

		// ?: operator

		System.out.println("please enter an integer");
		int input = kb.nextInt();

		char grade = 'U';

		if(input >= 90) {
			grade = 'A';
		}
		else {
			grade = 'B';
		}


		char grade = (input >= 90) ? 'A' : 'B';		
 
		System.out.println("grade: " + grade);

		//find max of 2 numbers

		System.out.println("please enter an integer");
		int value1 = kb.nextInt();
		System.out.println("please enter an integer");
		int value2 = kb.nextInt();

		int max = 0;
		if (value1 > value2) {
			max = value1;
		}
		else {
			max = value2;
		}


		int max = (value1 > value2) ? value1 : value2;
		
		System.out.println("max: " + max);
*/

		// do-while loops


		int count = 0;
		int value = 0;
		do {
			System.out.println("please enter an integer");
			value = kb.nextInt();

			if (value != 0 && value % 5 == 0) {
				count++;
			}

		} while(value != 0);

		System.out.println("count: " + count);



	





		

	}
}