import kotlin.math.max

fun main(arr:Array<String>) {
    val columnCount = readLine()!!.toInt()
    val barCount = readLine()!!.toInt()
    val barMap = (0 until barCount).map { readLine()!!.split(" ").map { it.toInt() - 1 } }

    val moveTo = (0 until columnCount).map {
        getGoal(it, barMap)
    }

    var cycleList = (0 until columnCount).map { 0 }
    var numList = (0 until columnCount).map { it }
    for(i in (1..100)) {
        var tmp = numList.withIndex().sortedBy { moveTo[it.index] }.map { it.value }
        numList = tmp
        cycleList = cycleList.withIndex().map { if(it.value > 0) it.value else(if (numList[it.index] == it.index) i else 0) }
    }

    val ans = cycleList.map { it.toLong() }.reduce { acc, i -> getMinKoubai(acc, i) }
    println(ans)
}

fun getMinKoubai(num1:Long, num2:Long):Long {
    val kouyaku = getMaxKouyaku(num1, num2)
    return num1 * num2 / kouyaku
}

fun getMaxKouyaku(num1:Long, num2:Long):Long {
    if(num1 % num2 == 0L) {
        return num2
    }
    return getMaxKouyaku(num2, num1%num2)
}

fun getGoal(column:Int, barMap:List<List<Int>>):Int {
    var current = column
    for((f,t) in barMap) {
        if(f == current) {
            current = t
        } else if(current == t) {
            current = f
        }
    }
    return current
}