N = int(input()) num = 0 if N >= 50: remainder = N % 50 quotient = N // 50 num = num + quotient * 7 if remainder >= 30: quotient = remainder // 30 remainder = remainder % 30 num = num + quotient * 4 if remainder >= 10: remainder = remainder // 10 num = num + remainder elif N >= 30: quotient = N // 30 remainder = N % 30 num = num + quotient * 4 if remainder >= 10: remainder = remainder // 10 num = num + remainder elif N >= 10: quotient = N //10 num = num + quotient print(num)