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    if __name__ == '__main__':
        n = int(input())
        student_marks = {}
        for _ in range(n):
            name, *line = input().split()
            scores = list(map(float, line))
            student_marks[name] = scores
        query_name = input()
        
        if query_name in student_marks:
            scores = student_marks[query_name]
            avg_score = sum(scores)/len(scores)
            print(f"{avg_score:.2f}")