# your code goes here
def F(n):
a, b = 0, 1
for i in range(n):
a, b = b, a+b
return a
dic = {20: F(20), 10: F(10)}
print(dic)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmRlZiBGKG4pOiAKICAgIGEsIGIgPSAwLCAxCiAgICBmb3IgaSBpbiByYW5nZShuKTogCiAgICAgICAgYSwgYiA9IGIsIGErYgogICAgcmV0dXJuIGEKCmRpYyA9IHsyMDogRigyMCksIDEwOiBGKDEwKX0KcHJpbnQoZGljKQ==