s1 = []
with open('k15.csv', 'r') as file:
    s = file.readlines()
for i in range(1, len(s)):
    s1.append(s[i][:s[i].rfind(',') + 1] + f"{int(s[i][s[i].rfind(',') + 1:]) - 1}")
with open('k15_changed.csv', 'w') as file:
    print(*s1, file=file, sep='\n')