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func convertToBase7(num int) string {
    if num == 0 {
        return "0"
    }
    var minus bool
    if num < 0 {
        num = -num
        minus = true
    }
    res := ""
    for num != 0 {
        d := num % 7
        num /= 7
        res = string(d + '0') + res
    }
    if minus {
        res = "-" + res
    }
    return res
}