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# 금민수의 개수 | ||
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def count_gumminsu(A, B): | ||
def generate_gumminsu(n): | ||
# 금민수를 생성하는 함수 | ||
if n > B: | ||
return 0 | ||
count = 0 | ||
if n >= A: | ||
count += 1 | ||
count += generate_gumminsu(n * 10 + 4) # 4를 추가한 경우 | ||
count += generate_gumminsu(n * 10 + 7) # 7을 추가한 경우 | ||
return count | ||
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result = generate_gumminsu(0) | ||
return result | ||
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# 입력 받기 | ||
A, B = map(int, input().split()) | ||
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# 금민수 개수 출력 | ||
result = count_gumminsu(A, B) | ||
print(result) |