from flask import Flask, render_template, request, jsonify

app = Flask(__name__, template_folder=".")

@app.route('/')
def index():
    return render_template('it.html')

@app.route('/calculate', methods=['POST'])
def calculate():
    data = request.get_json()

    number = int(data['number'])

    return jsonify({
        'plus': number + 1,
        'minus': number - 1
    })

if __name__ == '__main__':
    app.run(host="198.110.204.9", debug=True)