a,b,c=eval(input().replace(' ',','))
def func(x):
if x==0:
return a
if x==1:
return b
return func(x-1)+func(x-2)
print(func(c))206. Reverse Linked List | 83. Remove Duplicates from Sorted List |
116. Populating Next Right Pointers in Each Node | 145. Binary Tree Postorder Traversal |
94. Binary Tree Inorder Traversal | 101. Symmetric Tree |
77. Combinations | 46. Permutations |
226. Invert Binary Tree | 112. Path Sum |
1556A - A Variety of Operations | 136. Single Number |
169. Majority Element | 119. Pascal's Triangle II |
409. Longest Palindrome | 1574A - Regular Bracket Sequences |
1574B - Combinatorics Homework | 1567A - Domino Disaster |
1593A - Elections | 1607A - Linear Keyboard |
EQUALCOIN Equal Coins | XOREQN Xor Equation |
MAKEPAL Weird Palindrome Making | HILLSEQ Hill Sequence |
MAXBRIDGE Maximise the bridges | WLDRPL Wildcard Replacement |
1221. Split a String in Balanced Strings | 1002. Find Common Characters |
1602A - Two Subsequences | 1555A - PizzaForces |