a simple calculator

[Solstice]

A simple calculator, for simple calculations.

print("simple calculator by Solstice")
print("I-----I")
print("I00000I")
print("I-----I")
print("I1 2 3I")
print("I4 5 6I")
print("I7 8 9I")
print("I-----I")
print("        ")
print("when the program asks for +- x : type restart to make some space")
f=1
while f==1:
    c=input("+/-/x/:?")
    if c=="+":
        x=input("first number ")
        y=input("number to add ")
        z=int(x)+int(y)
        print(z)
        input("results(Enter to continue)")
    if c=="-":
        x=input("first number ")
        y=input("minus which number? ")
        z=int(x)-int(y)
        print(z)
        input("results(Enter to continue)")
    if c=="x":
        x=input("first number ")
        y=input("times what? ")
        z=int(x)*int(y)
        print(z)
        input("results(Enter to continue)")
    if c==":":
        x=input("first number ")
        y=input("divided by which number? ")
        z=int(x)/int(y)
        print(z)
        input("results(Enter to continue)")
    if c=="restart":
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print(" ")
        print("===========================================================")
        print("I                      New calculation                    I")
        print("===========================================================")