def main():
    print('==Exercise 2==')
    print('formula: s=3.14 * (1+a/b)^3')
    flag = True
    while flag:
        a = input("pls input number a:")
        try: 
            a = int(a)
            flag=False
        except :
            print("pls input a number!")
    flag=True
    while flag:
        b = input("pls input number b:")
        try: 
            b = int(b)
            flag=False
        except :
            print("pls input a number!")

    print(f"The result for S= {3.14*(1+(a+b)**3)}")

    print('==End Of Ex2==')
    return 0

if __name__ == '__main__':
    main()