private int getMaxNumberOfTokens(String input) {
		String [] expressionArray;
		int numberOfTokens = 0;
		expressionArray = new String [input.length()];
		String expression = input;
		int i = 1;
		while ( i >= 1) {
			if (expression.length() > 1){
				expressionArray[i] = getToken(expression);
				numberOfTokens++;
				expression = removeBottomToken(expression);
				i++;
			} else {
				expressionArray[i] = getToken(expression);
				numberOfTokens++;
				i = 0;
			}

		}

		return numberOfTokens;
	}