Dynamic border of a rectangle

I want to create a hallow rectangle with a dynamic border, which means that if I input 3, then the border is going to be 3 columns thick. I've managed to do it with pre-given value, but I want the values to be inputted by the user.

#include <stdio.h>

int main()
{
    int i, j, n, m;
    printf("Rows: ");
    scanf("%d", &n);
    printf("Columns: ");
    scanf("%d", &m);
    
    for(i=1; i<=n; i++){
        for(j=1; j<=m; j++){
            if(i==1 || i==2 || i==3 || i==n-2 || i==n-1 || i==n || j==1 || j==2 || j== 3 || j==m-2 || j==m-1 || j==m){
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");
    }

    return 0;
}