Error while assigning values to a struct using pointers

Error while assigning values to a struct using pointers

I am new to C and have been trying to get this simple code run which makes
use of pointers to struct for calculating the average of grades entered.
After entering the maths grade, the program throws an error and stops.
What am I doing wrong. Its also my first post in here, so please bear with
me for any inconsistencies. Thanks!
#include <stdio.h>
#include <stdlib.h>
typedef struct
{
char *name;
int mathGrade,scienceGrade,historyGrade,englishGrade;
}reportCard;
void average(reportCard *rc)
{
int avg = (rc->mathGrade
+rc->scienceGrade+rc->historyGrade+rc->englishGrade)/4;
printf("The overall grade of %s is: %i ",rc->name, avg);
}
int main()
{
reportCard rc;
printf("Enter the Students Last name: ");
char studentName[20];
scanf("%s", studentName);
rc.name=studentName;
printf("Math Grade: \n");
scanf("%i", rc.mathGrade);
printf("Science Grade: \n");
scanf("%i", rc.scienceGrade);
printf("History Grade: \n");
scanf("%i", rc.historyGrade);
printf("English Grade: \n");
scanf("%i", rc.englishGrade);
average(&rc);
return 0;
}