class Problem0191:
    def solve(this):
        n = int(input())
        c = list(map(int, input().split()))
        
        t = sum(c) * 0.1
        res = 0
        for i in c:
            if i <= t:
                res += 30
        print(res)

if __name__ == "__main__":
    problem = Problem0191()
    problem.solve()