it compiles but wrong years
#include <cs50.h>
#include <stdio.h>
int main(void)
{
int n,e;
do
{
n = get_int("Start Size:");
} while (n < 9);
do
{
e = get_int("End Size:");
} while (e < n);
n= n + n/3 - n/4;
printf("Years: %i\n", n);
}