12 lines
197 B
Python
12 lines
197 B
Python
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import math
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a = list(map(float, input().split(' ')))
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rate = a[0]
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sums = 0
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for i in range(1,len(a)):
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sums += round(math.e**(-1*rate) * (rate**a[i]/math.factorial(int(a[i]))), 4)
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print(sums)
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