C# Calculator - Basic Scripting #42(0)

string val1;
string val2;
int res;
input1 = Console.ReadLine();
val1 = input1;
res = Convert.ToInt32(val1);
input2 = Console.ReadLine();
val2 = input2;
res = Convert.ToInt32(val2);
Console.WriteLine("Do you want to add, subtract, divide, or multiply?");
input3 = Console.ReadLine();
if input3 == "Add"
    Console.WriteLine(numeral1 + numeral2);
if input3 == "Subtract"
    Console.WriteLine(numeral1 - numeral2);
if input3 == "Divide"
    Console.WriteLine(numeral1 / numeral2);
if input3 == "Multiply"
    Console.WriteLine(numeral1 * numeral2);
if else
    Console.WriteLine("Sorry, I didn't understand what you inputted.");