Problem:
https://codeforces.com/contest/214/problem/A
Solution:
https://ideone.com/92cmbS

Problem:
https://codeforces.com/contest/244/problem/A
Solution:
https://ideone.com/uM4rIX

Problem:
https://codeforces.com/contest/78/problem/A
Solution:
https://ideone.com/Qp7rXI

Problem:
https://codeforces.com/contest/369/problem/A
Solution:
https://ideone.com/YySGEG

Problem:
https://codeforces.com/contest/496/problem/A
Solution:
https://ideone.com/Pl4c0O