def prim(x):
    k=0
    for a in range(2,x):
        if x % a == 0:
            k = 1
            break
    if k == 0:
        return 1
    else: 
        return 0

p = input("Emirps till:")
l = []
for x in range(2,p):
    y=str(x)
    if (prim(x) == 1) and (prim(int(y[::-1])))==1 and (y != y[::-1]):
        l.append(x)

    
print(l)