一直被卡在60分 只会C语言 各位大佬求教

#include <stdio.h>
int main()
{
    int m, t, s;
	scanf_s("%d %d %d", &m, &t, &s);
	int apple=0;
	if (t!= 0)
	{
		if (s % t == 0)
			apple = m - s / t;
		else apple = m - 1 - s / t;
	}
	else
		apple = 0;
	printf("%d\n", apple);
	return 0;
}