E - Fraction Floor Sum Editorial by kyopro_friends
import math
N=int(input())
sqrtN=math.isqrt(N)
print(2*sum(N//i for i in range(1,sqrtN+1))-sqrtN*sqrtN)
posted:
last update:
import math
N=int(input())
sqrtN=math.isqrt(N)
print(2*sum(N//i for i in range(1,sqrtN+1))-sqrtN*sqrtN)
posted:
last update: