小学数学

import java.util.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;

public class Main {

	public static void main(String[] args) throws ParseException {
		// TODO Auto-generated method stub
		Scanner cin = new Scanner(System.in);
		int flag = 0;
		
		while (cin.hasNext()) {
			int f = 0;
			String str = cin.next();

			for (int i = 0; i < str.length(); i++) {
				char ch = str.charAt(i);
				if (ch == '+') {
					f = 1;
				}
				if (ch == '-') {
					f = 2;
				}
			}
			String str1[] = str.split("\\+|\\-|\\=|\\?");// 用字符串数组存起来
			//System.out.println(str1.length);
			int count = str1.length;
			if (count == 3) {
				int a = Integer.parseInt(str1[0]);// parseInt后面加String类型
				int b = Integer.parseInt(str1[1]);
				int c = Integer.parseInt(str1[2]);
				if (f == 1) {
					if (a + b == c) {
						flag++;
						//System.out.println(flag);
					}
				}
				if (f == 2) {
					if (a - b == c) {
						flag++;
					}
				}
			}
		}
		System.out.println(flag);
	}
}