没数据。

#include<bits/stdc++.h>
#define int long long
#define INF 0x3f3f3f
using namespace std;
int n,x,y;
signed main(){
	cin>>n>>x>>y;
	if(y%x==0)cout<<n-y/x;
	else cout<<n-y/x-1;
	return 0;
}

Python :

# coding=utf-8
a,b,c=map(int,input().split())
d=float(c)/b
if(int(d)!=d):
    d=int(d)+1
print(a-d)