from math import sqrt
def fermat(n):
    N=round(sqrt(n))+1
    for i in range(1,N):
        if i**2==n:
            return str(i)+"^2"
    for i in range(1,N):
        for j in range(1,N):
            if i**2+j**2==n:
                return str(i)+"^2 + "+str(j)+"^2"
    for i in range(1,N):
        for j in range(1,N):
            for k in range(1,N):
                if i**2+j**2+k**2==n:
                    return str(i)+"^2 + "+str(j)+"^2 + "+str(k)+"^2"
                else:
                    for l in range(1,N):
                        if i**2+j**2+k**2+l**2==n:
                            return str(i)+"^2 + "+str(j)+"^2 + "+str(k)+"^2 + "+str(l)+"^2"