import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.io.PrintWriter
import java.util.*

fun PrintWriter.solve(sc: FastScanner) {
    val arr = arrayOf(Triple(0,0,0), Triple(1,5,5), Triple(2,10,10), Triple(3,16,4), Triple(4,21,9), Triple(5,27,3), Triple(6,32,8), Triple(7,38,2), Triple(8,43,7), Triple(9,49,1), Triple(10,54,6), Triple(12,0,0))
    val arr2 = arr.map { it.first * 3600 + it.second * 60 + it.third * 60 / 11.0 }.toTypedArray()
    val a = sc.nextInt() % 12
    val b = sc.nextInt()
    var t = a * 3600 + b * 60
    for (v in arr2) {
        if (v - t >= 0) {
            println((v - t).toInt())
            break
        }
    }
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve(FastScanner(System.`in`))
    writer.flush()
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = BufferedReader(InputStreamReader(s))

    fun next(): String {
        while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())

        return st.nextToken()
    }

    fun nextInt() = next().toInt()
    fun nextLong() = next().toLong()
    fun nextLine() = br.readLine()
    fun nextDouble() = next().toDouble()
    fun ready() = br.ready()
}