Cannot add int to a int.

I am writing a program to find the average value of numbers entered but I am having difficulty getting the total value of all the numbers to show. Could you please help me with this code I have written?

Thanks

//program to find the average of values entered
#include <stdio.h>
int main()
{
  int sumOfValues = 0;
  int numberOfValueEntered = 0;
  int storage = 0;
  float averageOfValues = 0.0;

  printf("Enter a number or enter 0 to find the average of numbers entered\n");

  scanf("%i", &storage ); // reads the value and saves it in storage

  while (storage != 0) // when storage is not 0 carry out loop
  {
    ++numberOfValueEntered ; //adds one to numberOfValueEntered
    (storage += sumOfValues ); //adds the value of storage to sumOfValues 

    printf("%i,%i" ,numberOfValueEntered,sumOfValues); //test to see if numberOfValueEntered,sumOfValues is working correctly
    storage = 0; // return value of starage to 0
    printf("Please enter the next number or type 0 to exit\n");
    scanf("%i", &storage ); // reads the value and saves it in storage

  }// exits the loop when 0 is entered
  averageOfValues = (sumOfValues / numberOfValueEntered); //works out the average and stores it in averageOfValues
  //prints all the values averages etc
  printf("The results are as follows\n");
  printf("you have entered %d numbers, The total value of numbers entered is %i, and the average is %f",
    numberOfValueEntered,sumOfValues, averageOfValues); 

  return 0;
}