Codeforces Divisibility【水题】

 

A. Divisibility

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Find the number of k-divisible numbers on the segment [a, b]. In other words you need to find the number of such integer values x thata ≤ x ≤ b and x is divisible by k.

Input

The only line contains three space-separated integers k, a and b (1 ≤ k ≤ 1018; - 1018 ≤ a ≤ b ≤ 1018).

Output

Print the required number.

Examples

input

1 1 10

output

10

input

2 -4 4

output

5

 

#include <map>
#include <set>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <queue>
#include <iostream>
#include <stack>
#include <cmath>
#include <vector>
#include <cstdlib>
//#include <bits/stdc++.h>
#define space " "
using namespace std;
typedef long long LL;
//typedef __int64 Int;
typedef pair<int,int> paii;
const int INF = 0x3f3f3f3f;
const double ESP = 1e-5;
const double Pi = acos(-1);
const int MOD = 1e9+5;
const int MAXN = 1e5;
long long k, a, b, ans;
int main() {
    while (scanf("%lld%lld%lld", &k, &a, &b) != EOF) {
        ans = 0; 
        if ((a > 0 && b > 0) || (a < 0 && b < 0)) {
            ans += abs(b/k); ans -= abs(a/k);
            if (ans < 0) ans = -ans;
            if (min(abs(a), abs(b))%k == 0) ans++;
        }
        else {
            ans += abs(b/k); ans += abs(a/k);
            ans++;
        }
        printf("%lld\n", ans);
    }
    return 0;
}