// compile: make data
// run: ./data < data.in
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#ifdef LOCAL
#include <debug/codeforces.h>
#define debug(x...) _debug_print(#x, x);
#define Debug(x...) _debug_print_format(#x, x);
std::ifstream terminal("/dev/tty");
#define PP cerr<<"\033[1;30mpause...\e[0m",terminal.ignore();
#else
#define debug(x...)
#define Debug(x...)
#define PP
#endif
template<typename...Args> void print_(Args...args){((cout<<args<<" "),...)<<endl;}
#define rep(i,a,b) for(int i=(a);i<(int)(b);++i)
#define sz(v) ((int)(v).size())
#define print(...) print_(__VA_ARGS__);
#define FIND(a, x) ((find(a.begin(),a.end(),(x))!=a.end())?1:0)
#define cmin(x,...) x=min({(x),__VA_ARGS__})
#define cmax(x,...) x=max({(x),__VA_ARGS__})
#define INTMAX (int)(9223372036854775807)
#define INF (int)(1152921504606846976)
#define NaN (int)(0x8b88e1d0595d51d1)
#define double long double
#define int long long
#define uint unsigned long long
#define MAXN 1000010

int32_t main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

    int n, q; cin >> n >> q;
    vector<vector<int>> dp(MAXN, vector<int>(20, INF));
    rep(i, 0, n) {
        int start, end; cin >> start >> end;
        cmin(dp[start][0], end);
    }
    for (int i = MAXN-2; i >= 0; --i) cmin(dp[i], dp[i+1]);
    rep(j, 1, 20) {
        rep(i, 0, MAXN) {
            if (dp[i][j-1] == INF) continue;
            dp[i][j] = dp[dp[i][j-1]][j-1];
        }
    }
    while (q--) {
        int start, end; cin >> start >> end;
        int ans = 0;
        for (int i = 19; i >= 0; --i) {
            if (dp[start][i] <= end) {
                ans += (1<<i);
                start = dp[start][i];
            }
            if (start > end) break;
        }
        printf("%lld\n", ans);
    }

    return 0;
}