//: Playground - noun: a place where people can play
func trim(_ inStr:String)->String {
    var charArr = inStr.map{$0};
    var str = inStr
    for i in 0..<inStr.count {
        if(charArr[i] != " " && charArr[i] != "\n") {
            str = inStr.suffix(inStr.count - i).description
            break
        }
    }
    charArr = str.map{$0}
    for i in 0..<charArr.count {
        if(charArr[charArr.count-1-i] != " " && charArr[charArr.count-1-i] != "\n") {
            str = str.prefix(charArr.count-i).description
            break
        }
    }
    return str
}
func makeReadLineMethod()->()->String? {
    var baseStr:String = """


0.2820 7000


"""
    var initStr = trim(baseStr).split(separator: "\n").map(String.init)
    var idx = -1;
    func proc()->String? {
        idx+=1
        return initStr[idx];
    }
    return proc;
}
var readLine = makeReadLineMethod();


let inpt = readLine()!.split(separator: " ").map{Double($0)!}
var wk = inpt[0] * 10000
var tmp = String(wk).split(separator: ".").map{Double($0)!}[0]
wk = tmp*inpt[1]/10000

print(Int(wk))