from collections import Counter
 
def calculate_similarity_score(input_data):
    # Parse the input into two lists
    left_list = []
    right_list = []
 
    for line in input_data.strip().split("\n"):
        left, right = map(int, line.split())
        left_list.append(left)
        right_list.append(right)
 
    # Count occurrences in the right list
    right_counts = Counter(right_list)
 
    # Calculate the similarity score
    similarity_score = 0
    for number in left_list:
        similarity_score += number * right_counts.get(number, 0)
 
    return similarity_score
 
 
# Example Input
input_data = """
3   4
4   3
2   5
1   3
3   9
3   3
"""
 
# Calculate and print the result
result = calculate_similarity_score(input_data)
print("Similarity Score:", result)# your code goes here

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