import std.stdio, std.algorithm, std.conv, std.array, std.string, std.math, std.typecons, std.numeric;

void main()
{
    auto nm = readln.split.to!(int[]);
    auto N = nm[0];
    auto M = nm[1];

    int l = 1, r = N;
    foreach (_; 0..M) {
        writeln(l, " ", r);
        ++l;
        --r;
    }
}