#include<stdio.h>
int main()

{	int m, t, s;
	
    scanf("%d%d%d", &m, &t, &s);
	
    if(t != 0)
	
    {
	
    int a, b;
	
    a = s / t;
	
    if(s % t != 0)
	
    {b = m - a + 1;}
	
    else
	
    {b = m - a;}
	
    if(b <= 0)
	
    {printf("0");}
	
    else
	
    {printf("%d", b);}
	
    }else
	
    {printf("0"); }
	
    return 0;}