R=range
N=int(input())
O=print
c={}
c[0]=s=0;
for i in R(10**6+1):s+=i**3;c[s]=i
a=[]
for v in c:
	if v-N in c:a+=[(c[v-N]+1,c[v])]
O(len(a))
for L,R in sorted(a):O(L,R)