请大神帮我看一下程序有什么问题，谢谢

#include <stdio.h>
#include <Windows.h>
int main()
{
int m, n;
scanf_s("%d%d", &m, &n);
int *pan = (int*)calloc(m, sizeof(n));
int i, j;
for (i = 0;i < m;i++)
{
for (j = 0;j < n;j++)
{
scanf_s("%d", pan);
pan++;
}
}
for (i = 0;i < m;i++)
{
for (j = 0;j < n;j++)
{
printf("%d ", *pan);
pan++;
}
printf("\n");
}
system("pause");
return 0;
}