import java.util.*;

//my good solution

public class CalculatorSimple {

public static int calculator(String input) {

int num1 = 0;

int num2 = 0;

char preop = ' ';

boolean isNum1End = false;

for (int i = 0; i < input.length(); i++) {

char c = input.charAt(i);

if (Character.isDigit(c)) {

if (!isNum1End) {

num1 = num1 * 10 + c - '0';

}

else {

num2 = num2 * 10 + c - '0';

}

}

if (!Character.isDigit(c) || i == input.length() - 1) { // c is not Digit, else is WRONG!

if (!isNum1End) {

isNum1End = true;

}

if (preop == '+') {

num1 = num1 + num2;

}

else if (preop == '-') {

num1 = num1 - num2;

}

preop = c;

num2 = 0;

}

}

return num1;

}

public static void main(String[] args) {

int res = calculator("5+60");

System.out.println(res);

}

}