import math
inFile = open("DATA2.txt","r")
outFile = open("OUT2.txt","w")
outFile.close()
for x in range(0,5):
    outFile = open("OUT2.txt","a")
    N = int(inFile.readline().rstrip("\n"))
    sum = N
    for width in range(2,int(math.sqrt(N))+1):
        length = width
        while length*width<=N:
            sum = sum + 1
            length = length + 1           
    outFile.write(str(sum)+"\n")
    outFile.close()
inFile.close()