#include <bits/stdc++.h>

using namespace std;

//结点数<=100
int n, m, tree[101] = {0};

int main() {
    int i, x, y, root, maxroot, sum, j, Max = 0;
    cin >> n >> m;//节点和边的数目
    for (i = 1; i <= m; i++) {
        cin >> x >> y;
        tree[y] = x;    //y是x的孩子
    }
    //找出树根
    for (i = 1; i <= n; i++) {
        // i的父亲节点为0，即没有父亲节点
        if (tree[i] == 0) {
            root = i;
            break;
        }
    }
    //找孩子最多的节点maxroot
    for (i = 1; i <= n; i++) {
        sum = 0;
        for (j = 1; j <= n; j++) {
            if (tree[j] == i) sum++;
        }
        if (sum > Max) {
            Max = sum;
            maxroot = i;
        }
    }
    /*
    cout << root << endl;
    cout << maxroot << endl;
    
    //maxroot的孩子
    for (i = 1; i <= n; i++) {
        if (tree[i] == maxroot) {
            cout << i << " ";
        }
    }*/
    return 0;
}