#include <stdio.h>

int main() {

int m,s,t,n;
scanf("%d %d %d",&m,&t,&s);      

if(t == 0)
{
	return 0;
}  else
{

	if (s % t ==0)
	{
		n = m - s / t;
		if(n >= 0) {printf("%d",n);}
		else  {printf("0");}	
	}  
	else
	{
		n = m - s / t - 1;
		if(n >= 0){printf("%d",n);}
		else  {printf("0");}
	}
}

return 0;

}```c