func hoge(_ m: Int, _ dayCount: Int) -> Int {
    var count: Int = 0
    for d in 1...dayCount {
        if dayCount < 10 { continue }
        let s = "\(dayCount)"
        let former = Int(String(s[s.startIndex]))!
        let latter = Int(String(s.suffix(1)))!
        if m == former + latter { count += 1 }
    }
    return count
}


let eoms = [31,28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
var counts = 0
for (i, eom) in eoms.enumerated() {
    counts += hoge(i, eom)
}
print(counts)