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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))
Project Euler #1: Multiples of 3 and 5
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tried so hard to get this right :')