Problem: Once n people simultaneously signed in to the reception at the recently opened, but already thoroughly bureaucratic organization (abbreviated TBO). As the organization is thoroughly bureaucratic, it can accept and cater for exactly one person per day. As a consequence, each of n people made an appointment on one of the next n days, and no two persons have an appointment on the same day.

However, the organization workers are very irresponsible about their job, so none of the signed in people was told the exact date of the appointment. The only way to know when people should come is to write some requests to TBO.

The request form consists of m empty lines. Into each of these lines the name of a signed in person can be written (it can be left blank as well). Writing a person's name in the same form twice is forbidden, such requests are ignored. TBO responds very quickly to written requests, but the reply format is of very poor quality — that is, the response contains the correct appointment dates for all people from the request form, but the dates are in completely random order. Responds to all requests arrive simultaneously at the end of the day (each response specifies the request that it answers).

Fortunately, you aren't among these n lucky guys. As an observer, you have the following task — given n and m, determine the minimum number of requests to submit to TBO to clearly determine the appointment date for each person.

Input

The first line contains a single integer t (1 ≤ t ≤ 1000) — the number of test cases. Each of the following t lines contains two integers n and m (1 ≤ n, m ≤ 109) — the number of people who have got an appointment at TBO and the number of empty lines in the request form, correspondingly.

Output

Print t lines, each containing an answer for the corresponding test case (in the order they are given in the input) — the minimum number of requests to submit to TBO.

Examples

Input

5
4 1
4 2
7 3
1 1
42 7


Output

3
2
3
0
11

Note

In the first sample, you need to submit three requests to TBO with three different names. When you learn the appointment dates of three people out of four, you can find out the fourth person's date by elimination, so you do not need a fourth request.

In the second sample you need only two requests. Let's number the persons from 1 to 4 and mention persons 1 and 2 in the first request and persons 1 and 3 in the second request. It is easy to see that after that we can clearly determine each person's appointment date regardless of the answers obtained from TBO.

In the fourth sample only one person signed up for an appointment. He doesn't need to submit any requests — his appointment date is tomorrow.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:36777216")
template <class T>
inline void RD(T &);
template <class T>
inline void OT(const T &);
inline int RD() {
  int x;
  RD(x);
  return x;
}
template <class T>
inline T &_RD(T &x) {
  RD(x);
  return x;
}
inline void RC(char &c) { scanf(" %c", &c); }
inline void RS(char *s) { scanf("%s", s); }
template <class T0, class T1>
inline void RD(T0 &x0, T1 &x1) {
  RD(x0), RD(x1);
}
template <class T0, class T1, class T2>
inline void RD(T0 &x0, T1 &x1, T2 &x2) {
  RD(x0), RD(x1), RD(x2);
}
template <class T0, class T1, class T2, class T3>
inline void RD(T0 &x0, T1 &x1, T2 &x2, T3 &x3) {
  RD(x0), RD(x1), RD(x2), RD(x3);
}
template <class T0, class T1, class T2, class T3, class T4>
inline void RD(T0 &x0, T1 &x1, T2 &x2, T3 &x3, T4 &x4) {
  RD(x0), RD(x1), RD(x2), RD(x3), RD(x4);
}
template <class T0, class T1, class T2, class T3, class T4, class T5>
inline void RD(T0 &x0, T1 &x1, T2 &x2, T3 &x3, T4 &x4, T5 &x5) {
  RD(x0), RD(x1), RD(x2), RD(x3), RD(x4), RD(x5);
}
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6>
inline void RD(T0 &x0, T1 &x1, T2 &x2, T3 &x3, T4 &x4, T5 &x5, T6 &x6) {
  RD(x0), RD(x1), RD(x2), RD(x3), RD(x4), RD(x5), RD(x6);
}
template <class T0, class T1>
inline void OT(T0 &x0, T1 &x1) {
  OT(x0), OT(x1);
}
template <class T0, class T1, class T2>
inline void OT(T0 &x0, T1 &x1, T2 &x2) {
  OT(x0), OT(x1), OT(x2);
}
template <class T0, class T1, class T2, class T3>
inline void OT(T0 &x0, T1 &x1, T2 &x2, T3 &x3) {
  OT(x0), OT(x1), OT(x2), OT(x3);
}
template <class T0, class T1, class T2, class T3, class T4>
inline void OT(T0 &x0, T1 &x1, T2 &x2, T3 &x3, T4 &x4) {
  OT(x0), OT(x1), OT(x2), OT(x3), OT(x4);
}
template <class T0, class T1, class T2, class T3, class T4, class T5>
inline void OT(T0 &x0, T1 &x1, T2 &x2, T3 &x3, T4 &x4, T5 &x5) {
  OT(x0), OT(x1), OT(x2), OT(x3), OT(x4), OT(x5);
}
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6>
inline void OT(T0 &x0, T1 &x1, T2 &x2, T3 &x3, T4 &x4, T5 &x5, T6 &x6) {
  OT(x0), OT(x1), OT(x2), OT(x3), OT(x4), OT(x5), OT(x6);
}
template <class T>
inline void RST(T &A) {
  memset(A, 0, sizeof(A));
}
template <class T0, class T1>
inline void RST(T0 &A0, T1 &A1) {
  RST(A0), RST(A1);
}
template <class T0, class T1, class T2>
inline void RST(T0 &A0, T1 &A1, T2 &A2) {
  RST(A0), RST(A1), RST(A2);
}
template <class T0, class T1, class T2, class T3>
inline void RST(T0 &A0, T1 &A1, T2 &A2, T3 &A3) {
  RST(A0), RST(A1), RST(A2), RST(A3);
}
template <class T0, class T1, class T2, class T3, class T4>
inline void RST(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4) {
  RST(A0), RST(A1), RST(A2), RST(A3), RST(A4);
}
template <class T0, class T1, class T2, class T3, class T4, class T5>
inline void RST(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4, T5 &A5) {
  RST(A0), RST(A1), RST(A2), RST(A3), RST(A4), RST(A5);
}
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6>
inline void RST(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4, T5 &A5, T6 &A6) {
  RST(A0), RST(A1), RST(A2), RST(A3), RST(A4), RST(A5), RST(A6);
}
template <size_t T>
inline void RST(bitset<T> &S) {
  S.reset();
}
template <class T>
inline void CLR(priority_queue<T, vector<T>, less<T> > &Q) {
  while (!Q.empty()) Q.pop();
}
template <class T>
inline void CLR(priority_queue<T, vector<T>, greater<T> > &Q) {
  while (!Q.empty()) Q.pop();
}
template <class T>
inline void CLR(T &A) {
  A.clear();
}
template <class T0, class T1>
inline void CLR(T0 &A0, T1 &A1) {
  CLR(A0), CLR(A1);
}
template <class T0, class T1, class T2>
inline void CLR(T0 &A0, T1 &A1, T2 &A2) {
  CLR(A0), CLR(A1), CLR(A2);
}
template <class T0, class T1, class T2, class T3>
inline void CLR(T0 &A0, T1 &A1, T2 &A2, T3 &A3) {
  CLR(A0), CLR(A1), CLR(A2), CLR(A3);
}
template <class T0, class T1, class T2, class T3, class T4>
inline void CLR(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4) {
  CLR(A0), CLR(A1), CLR(A2), CLR(A3), CLR(A4);
}
template <class T0, class T1, class T2, class T3, class T4, class T5>
inline void CLR(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4, T5 &A5) {
  CLR(A0), CLR(A1), CLR(A2), CLR(A3), CLR(A4), CLR(A5);
}
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6>
inline void CLR(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4, T5 &A5, T6 &A6) {
  CLR(A0), CLR(A1), CLR(A2), CLR(A3), CLR(A4), CLR(A5), CLR(A6);
}
template <class T>
inline void CLR(T &A, int n) {
  for (int i = 0; i < int(n); ++i) CLR(A[i]);
}
template <class T>
inline void FLC(T &A, int x) {
  memset(A, x, sizeof(A));
}
template <class T0, class T1>
inline void FLC(T0 &A0, T1 &A1, int x) {
  FLC(A0, x), FLC(A1, x);
}
template <class T0, class T1, class T2>
inline void FLC(T0 &A0, T1 &A1, T2 &A2) {
  FLC(A0), FLC(A1), FLC(A2);
}
template <class T0, class T1, class T2, class T3>
inline void FLC(T0 &A0, T1 &A1, T2 &A2, T3 &A3) {
  FLC(A0), FLC(A1), FLC(A2), FLC(A3);
}
template <class T0, class T1, class T2, class T3, class T4>
inline void FLC(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4) {
  FLC(A0), FLC(A1), FLC(A2), FLC(A3), FLC(A4);
}
template <class T0, class T1, class T2, class T3, class T4, class T5>
inline void FLC(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4, T5 &A5) {
  FLC(A0), FLC(A1), FLC(A2), FLC(A3), FLC(A4), FLC(A5);
}
template <class T0, class T1, class T2, class T3, class T4, class T5, class T6>
inline void FLC(T0 &A0, T1 &A1, T2 &A2, T3 &A3, T4 &A4, T5 &A5, T6 &A6) {
  FLC(A0), FLC(A1), FLC(A2), FLC(A3), FLC(A4), FLC(A5), FLC(A6);
}
template <class T>
inline void SRT(T &A) {
  sort(A.begin(), A.end());
}
template <class T, class C>
inline void SRT(T &A, C B) {
  sort(A.begin(), A.end(), B);
}
const int MOD = 1000000007;
const int INF = 0x3f3f3f3f;
const double EPS = 1e-9;
const double OO = 1e15;
const double PI = 3.14159265358979323846264;
template <class T>
inline void checkMin(T &a, const T b) {
  if (b < a) a = b;
}
template <class T>
inline void checkMax(T &a, const T b) {
  if (b > a) a = b;
}
template <class T, class C>
inline void checkMin(T &a, const T b, C c) {
  if (c(b, a)) a = b;
}
template <class T, class C>
inline void checkMax(T &a, const T b, C c) {
  if (c(a, b)) a = b;
}
template <class T>
inline T min(T a, T b, T c) {
  return min(min(a, b), c);
}
template <class T>
inline T max(T a, T b, T c) {
  return max(max(a, b), c);
}
template <class T>
inline T min(T a, T b, T c, T d) {
  return min(min(a, b), min(c, d));
}
template <class T>
inline T max(T a, T b, T c, T d) {
  return max(min(a, b), max(c, d));
}
template <class T>
inline T sqr(T a) {
  return a * a;
}
template <class T>
inline T cub(T a) {
  return a * a * a;
}
int Ceil(int x, int y) { return (x - 1) / y + 1; }
inline bool _1(int x, int i) { return x & 1 << i; }
inline bool _1(long long x, int i) { return x & 1LL << i; }
inline long long _1(int i) { return 1LL << i; }
inline long long _U(int i) { return _1(i) - 1; };
template <class T>
inline T low_bit(T x) {
  return x & -x;
}
template <class T>
inline T high_bit(T x) {
  T p = low_bit(x);
  while (p != x) x -= p, p = low_bit(x);
  return p;
}
inline int count_bits(int x) {
  x = (x & 0x55555555) + ((x & 0xaaaaaaaa) >> 1);
  x = (x & 0x33333333) + ((x & 0xcccccccc) >> 2);
  x = (x & 0x0f0f0f0f) + ((x & 0xf0f0f0f0) >> 4);
  x = (x & 0x00ff00ff) + ((x & 0xff00ff00) >> 8);
  x = (x & 0x0000ffff) + ((x & 0xffff0000) >> 16);
  return x;
}
inline int count_bits(long long x) {
  x = (x & 0x5555555555555555LL) + ((x & 0xaaaaaaaaaaaaaaaaLL) >> 1);
  x = (x & 0x3333333333333333LL) + ((x & 0xccccccccccccccccLL) >> 2);
  x = (x & 0x0f0f0f0f0f0f0f0fLL) + ((x & 0xf0f0f0f0f0f0f0f0LL) >> 4);
  x = (x & 0x00ff00ff00ff00ffLL) + ((x & 0xff00ff00ff00ff00LL) >> 8);
  x = (x & 0x0000ffff0000ffffLL) + ((x & 0xffff0000ffff0000LL) >> 16);
  x = (x & 0x00000000ffffffffLL) + ((x & 0xffffffff00000000LL) >> 32);
  return x;
}
int reverse_bits(int x) {
  x = ((x >> 1) & 0x55555555) | ((x << 1) & 0xaaaaaaaa);
  x = ((x >> 2) & 0x33333333) | ((x << 2) & 0xcccccccc);
  x = ((x >> 4) & 0x0f0f0f0f) | ((x << 4) & 0xf0f0f0f0);
  x = ((x >> 8) & 0x00ff00ff) | ((x << 8) & 0xff00ff00);
  x = ((x >> 16) & 0x0000ffff) | ((x << 16) & 0xffff0000);
  return x;
}
long long reverse_bits(long long x) {
  x = ((x >> 1) & 0x5555555555555555LL) | ((x << 1) & 0xaaaaaaaaaaaaaaaaLL);
  x = ((x >> 2) & 0x3333333333333333LL) | ((x << 2) & 0xccccccccccccccccLL);
  x = ((x >> 4) & 0x0f0f0f0f0f0f0f0fLL) | ((x << 4) & 0xf0f0f0f0f0f0f0f0LL);
  x = ((x >> 8) & 0x00ff00ff00ff00ffLL) | ((x << 8) & 0xff00ff00ff00ff00LL);
  x = ((x >> 16) & 0x0000ffff0000ffffLL) | ((x << 16) & 0xffff0000ffff0000LL);
  x = ((x >> 32) & 0x00000000ffffffffLL) | ((x << 32) & 0xffffffff00000000LL);
  return x;
}
inline void INC(int &a, int b) {
  a += b;
  if (a >= MOD) a -= MOD;
}
inline int sum(int a, int b) {
  a += b;
  if (a >= MOD) a -= MOD;
  return a;
}
inline void DEC(int &a, int b) {
  a -= b;
  if (a < 0) a += MOD;
}
inline int dff(int a, int b) {
  a -= b;
  if (a < 0) a += MOD;
  return a;
}
inline void MUL(int &a, int b) { a = (long long)a * b % MOD; }
inline int pdt(int a, int b) { return (long long)a * b % MOD; }
inline int pdt(int a, int b, int c) { return pdt(pdt(a, b), c); }
inline int pow(int a, int b) {
  int c = 1;
  while (b) {
    if (b & 1) MUL(c, a);
    MUL(a, a), b >>= 1;
  }
  return c;
}
template <class T>
inline int pow(T a, int b) {
  T c(1);
  while (b) {
    if (b & 1) MUL(c, a);
    MUL(a, a), b >>= 1;
  }
  return c;
}
inline int _I(int b) {
  int a = MOD, x1 = 0, x2 = 1, q;
  while (true) {
    q = a / b, a %= b;
    if (!a) return (x2 + MOD) % MOD;
    DEC(x1, pdt(q, x2));
    q = b / a, b %= a;
    if (!b) return (x1 + MOD) % MOD;
    DEC(x2, pdt(q, x1));
  }
}
inline void DIV(int &a, int b) { MUL(a, _I(b)); }
inline int qtt(int a, int b) { return pdt(a, _I(b)); }
inline int sum(int a, int b, int MOD) {
  a += b;
  if (a >= MOD) a -= MOD;
  return a;
}
inline int phi(int n) {
  int res = n;
  for (int i = 2; sqr(i) <= n; ++i)
    if (!(n % i)) {
      DEC(res, qtt(res, i));
      do {
        n /= i;
      } while (!(n % i));
    }
  if (n != 1) DEC(res, qtt(res, n));
  return res;
}
struct Po;
struct Line;
struct Seg;
inline int sgn(double x) { return x < -EPS ? -1 : x > EPS; }
inline int sgn(double x, double y) { return sgn(x - y); }
struct Po {
  double x, y;
  Po(double _x = 0, double _y = 0) : x(_x), y(_y) {}
  friend istream &operator>>(istream &in, Po &p) { return in >> p.x >> p.y; }
  friend ostream &operator<<(ostream &out, Po p) {
    return out << "(" << p.x << ", " << p.y << ")";
  }
  friend bool operator==(Po, Po);
  friend bool operator!=(Po, Po);
  friend Po operator+(Po, Po);
  friend Po operator-(Po, Po);
  friend Po operator*(Po, double);
  friend Po operator/(Po, double);
  bool operator<(const Po &rhs) const {
    return sgn(x, rhs.x) < 0 || sgn(x, rhs.x) == 0 && sgn(y, rhs.y) < 0;
  }
  Po operator-() const { return Po(-x, -y); }
  Po &operator+=(Po rhs) {
    x += rhs.x, y += rhs.y;
    return *this;
  }
  Po &operator-=(Po rhs) {
    x -= rhs.x, y -= rhs.y;
    return *this;
  }
  Po &operator*=(double k) {
    x *= k, y *= k;
    return *this;
  }
  Po &operator/=(double k) {
    x /= k, y /= k;
    return *this;
  }
  double length_sqr() { return sqr(x) + sqr(y); }
  double length() { return sqrt(length_sqr()); }
  double atan() { return atan2(y, x); }
  void input() { scanf("%lf %lf", &x, &y); }
};
bool operator==(Po a, Po b) {
  return sgn(a.x - b.x) == 0 && sgn(a.y - b.y) == 0;
}
bool operator!=(Po a, Po b) {
  return sgn(a.x - b.x) != 0 || sgn(a.y - b.y) != 0;
}
Po operator+(Po a, Po b) { return Po(a.x + b.x, a.y + b.y); }
Po operator-(Po a, Po b) { return Po(a.x - b.x, a.y - b.y); }
Po operator*(Po a, double k) { return Po(a.x * k, a.y * k); }
Po operator*(double k, Po a) { return a * k; }
Po operator/(Po a, double k) { return Po(a.x / k, a.y / k); }
struct Line {
  Po a, b;
  Line(Po _a = Po(), Po _b = Po()) : a(_a), b(_b) {}
  Line(double x0, double y0, double x1, double y1)
      : a(Po(x0, y0)), b(Po(x1, y1)) {}
  Line(Seg);
  friend ostream &operator<<(ostream &out, Line p) {
    return out << p.a << "-" << p.b;
  }
};
struct Seg {
  Po a, b;
  Seg(Po _a = Po(), Po _b = Po()) : a(_a), b(_b) {}
  Seg(double x0, double y0, double x1, double y1)
      : a(Po(x0, y0)), b(Po(x1, y1)) {}
  Seg(Line l);
  friend ostream &operator<<(ostream &out, Seg p) {
    return out << p.a << "-" << p.b;
  }
  double length() { return (b - a).length(); }
};
Line::Line(Seg l) : a(l.a), b(l.b) {}
Seg::Seg(Line l) : a(l.a), b(l.b) {}
inline double dot(double x1, double y1, double x2, double y2) {
  return x1 * x2 + y1 * y2;
}
inline double dot(Po a, Po b) { return dot(a.x, a.y, b.x, b.y); }
inline double dot(Po p0, Po p1, Po p2) { return dot(p1 - p0, p2 - p0); }
inline double dot(Line l1, Line l2) { return dot(l1.b - l1.a, l2.b - l2.a); }
inline double det(double x1, double y1, double x2, double y2) {
  return x1 * y2 - x2 * y1;
}
inline double det(Po a, Po b) { return det(a.x, a.y, b.x, b.y); }
inline double det(Po p0, Po p1, Po p2) { return det(p1 - p0, p2 - p0); }
inline double det(Line l1, Line l2) { return det(l1.b - l1.a, l2.b - l2.a); }
template <class T1, class T2>
inline double dist(T1 x, T2 y) {
  return sqrt(dist_sqr(x, y));
}
inline double dist_sqr(Po a, Po b) { return sqr(a.x - b.x) + sqr(a.y - b.y); }
inline double dist_sqr(Po p, Line l) {
  Po v0 = l.b - l.a, v1 = p - l.a;
  return sqr(fabs(det(v0, v1))) / v0.length_sqr();
}
inline double dist_sqr(Po p, Seg l) {
  Po v0 = l.b - l.a, v1 = p - l.a, v2 = p - l.b;
  if (sgn(dot(v0, v1)) * sgn(dot(v0, v2)) <= 0)
    return dist_sqr(p, Line(l));
  else
    return min(v1.length_sqr(), v2.length_sqr());
}
inline double dist_sqr(Line l, Po p) { return dist_sqr(p, l); }
inline double dist_sqr(Seg l, Po p) { return dist_sqr(p, l); }
inline double dist_sqr(Line l1, Line l2) {
  if (sgn(det(l1, l2)) != 0) return 0;
  return dist_sqr(l1.a, l2);
}
inline double dist_sqr(Line l1, Seg l2) {
  Po v0 = l1.b - l1.a, v1 = l2.a - l1.a, v2 = l2.b - l1.a;
  double c1 = det(v0, v1), c2 = det(v0, v2);
  return sgn(c1) != sgn(c2) ? 0
                            : sqr(min(fabs(c1), fabs(c2))) / v0.length_sqr();
}
bool isIntersect(Seg l1, Seg l2) {
  return min(l1.a.x, l1.b.x) <= max(l2.a.x, l2.b.x) &&
         min(l2.a.x, l2.b.x) <= max(l1.a.x, l1.b.x) &&
         min(l1.a.y, l1.b.y) <= max(l2.a.y, l2.b.y) &&
         min(l2.a.y, l2.b.y) <= max(l1.a.y, l1.b.y) &&
         sgn(det(l1.a, l2.a, l2.b)) * sgn(det(l1.b, l2.a, l2.b)) <= 0 &&
         sgn(det(l2.a, l1.a, l1.b)) * sgn(det(l2.b, l1.a, l1.b)) <= 0;
}
inline double dist_sqr(Seg l1, Seg l2) {
  if (isIntersect(l1, l2))
    return 0;
  else
    return min(dist_sqr(l1.a, l2), dist_sqr(l1.b, l2), dist_sqr(l2.a, l1),
               dist_sqr(l2.b, l1));
}
inline bool isOnExtremePoint(const Po &p, const Seg &l) {
  return p == l.a || p == l.b;
}
inline bool isOnseg(const Po &p, const Seg &l) {
  return sgn(det(p, l.a, l.b)) == 0 && sgn(l.a.x, p.x) * sgn(l.b.x, p.x) <= 0 &&
         sgn(l.a.y, p.y) * sgn(l.b.y, p.y) <= 0;
}
inline Po intersect(const Line &l1, const Line &l2) {
  return l1.a + (l1.b - l1.a) * (det(l2.a, l1.a, l2.b) / det(l2, l1));
}
inline Po intersect(const Po &p, const Line &l) {
  return intersect(Line(p, p + Po(l.a.y - l.b.y, l.b.x - l.a.x)), l);
}
inline Po rotate(Po p, double alpha, Po o = Po()) {
  p.x -= o.x, p.y -= o.y;
  return Po(p.x * cos(alpha) - p.y * sin(alpha),
            p.y * cos(alpha) + p.x * sin(alpha)) +
         o;
}
inline int rand32() {
  return (bool(rand() & 1) << 30) | (rand() << 15) + rand();
}
inline int random32(int l, int r) { return rand32() % (r - l + 1) + l; }
inline int random(int l, int r) { return rand() % (r - l + 1) + l; }
int dice() { return rand() % 6; }
bool coin() { return rand() % 2; }
template <class T>
inline void RD(T &x) {
  char c;
  for (c = getchar(); c < '0'; c = getchar())
    ;
  x = c - '0';
  for (c = getchar(); c >= '0'; c = getchar()) x = x * 10 + c - '0';
}
template <class T>
inline void OT(const T &p) {
  printf("%.0lf\n", p);
}
const int N = 1009;
int n, m;
long long C(int n, int m) {
  long long res = 1;
  for (int i = 1; i <= int(m); ++i) res *= (n - i + 1), res /= i;
  return res;
}
bool check(int k) {
  long long r = (long long)m * k;
  int n = ::n, t;
  for (int i = 0; i <= k && n && r >= 0; ++i) {
    t = min(C(k, i), (long long)n);
    n -= t, r -= (long long)i * t;
  }
  return r >= 0 && n == 0;
}
int main() {
  int T____;
  RD(T____);
  while (T____--) {
    RD(n, m), m = min(m, n / 2);
    int l = 0, r = n - 1;
    while (l < r) {
      int k = (l + r) >> 1;
      if (check(k))
        r = k;
      else
        l = k + 1;
    }
    cout << l << endl;
  }
}