#include <stdio.h> int main() { int n, x, y; scanf("%d %d %d", &n, &x, &y); int eaten = y / x; if (y % x != 0) eaten++; // 没吃完一个也算吃掉一个苹果 int left = n - eaten; if (left < 0) left = 0; printf("%d\n", left); return 0; }