#include<cstdio>
int main()
{
    int m,t,s;
    scanf("%d%d%d",&m,&t,&s);
    int d =s/t;
    int e = m -d;
    if(m==0||t==0||e<=0)
    {
    	printf("0");
    }else
    {
    	if(s%t==0)
	    {
            printf("%d",m-d);
        }else
        {
	        printf("%d",m-d-1);
	    }
    }
    return 0;
}