1. 
/*
 * ACM Contest training
 * Problem: 11878 - Homework Checker
 * Link: http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=226&page=show_problem&problem=3000
 *
 * @author Christoph Goettschkes
 * @version 1.0, 11/08/2010
 *
 * Method : Ad-Hoc
 * Status : Accepted
 * Runtime: 0.124
 */

import java.io.*;

class Main
{
	public static void main(String[] args) throws Exception {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		int counter = 0;

		do
		{
			String line = reader.readLine().trim();
			
			line = line.replaceAll("\\s", "");

			if (line.indexOf('?') < 0)
			{

				int sign = line.indexOf('-');
				char signChar = '-';
				if (sign == -1) {
					sign = line.indexOf('+');
					signChar = '+';
				}

				int equ = line.indexOf('=');

				int c = Integer.parseInt(line.substring(equ+1));

				int a = Integer.parseInt(line.substring(0, sign));
				int b = Integer.parseInt(line.substring(sign+1, equ));

				int calcC = (signChar == '+') ? a + b : a - b;

				if (calcC == c)
					counter++;
			}
		} while(reader.ready());
		System.out.println(counter);
		reader.close();
	}
}