21 lines
368 B
Python
21 lines
368 B
Python
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#!/usr/bin/env python3
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from collections import Counter
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list1 = [];
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list2 = [];
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with open("input.txt") as file:
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for line in file:
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if line.strip():
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num1,num2 = map(int, line.split())
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list1.append(num1)
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list2.append(num2)
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counts = Counter(list2)
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result = 0;
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for num in list1:
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if(counts.get(num)):
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result+=num*counts.get(num)
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print(f'Result: {result}')
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