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[AtCoder]ABC-313|A - To Be Saikyo
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提出結果
def getInt():
return int(input())
def getIntList():
return list(map(int, input().split()))
def main():
n = getInt()
a = getIntList()
if n == 1:
print(0)
else:
m = max(a[1:])
print(0 if a[0] > m else 1 if a[0] == m else m - a[0] + 1)
if __name__ == "__main__":
main()
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