func_code_string: #include <bits/stdc++.h>   const int MAXN = 100 * 1000;   int a[MAXN + 10];   int dp[MAXN + 10];   int mx = 0;   using namespace std;   int main() {     long long n, m, k, s = 0;     cin >> k >> n >> m;     long long shif = (k - (n % k)) % k;     n = n + shif;     if (m < n)       cout << 0 << endl;     else       cout << (m - n) / k + 1 << endl;   }   