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  1. All Contests
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  3. Project Euler #1: Multiples of 3 and 5
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Project Euler #1: Multiples of 3 and 5

  • suiyee06
     + 0 comments

    tried so hard to get this right :')

    import sys
t = int(input().strip())
for a0 in range(t):
    n = int(input().strip())
    a = ((n-1)//3)
    b = ((n-1)//5)
    c = ((n-1)//15)
    answer = (3*a*(a+1)//2) + (5*b*(b+1)//2) - (15*c*(c+1)//2)
    print (int(answer))