fun main() {
    val builder = StringBuilder()

    val times = listOf(
        Triple(0, 0, 0),
        Triple(1, 5, 27),
        Triple(2, 10, 54),
        Triple(3, 16, 21),
        Triple(4, 21, 49),
        Triple(5, 27, 16),
        Triple(6, 32, 43),
        Triple(7, 38, 10),
        Triple(8, 43, 38),
        Triple(9, 49, 5),
        Triple(10, 54, 32)
    )

    var (a, b) = readInputLine().split(" ").map { it.toInt() }
    var c = 0

    a %= 12

    var ans = 0

    while (true) {
        if (times.contains(Triple(a, b, c))) {
            break
        }
        ans++
        c++
        if (c == 60) {
            b++
            c = 0
        }
        if (b == 60) {
            a++
            a %= 12
            b = 0
        }
    }

    builder.appendln(ans)

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}