PYTHON

要用exit()

#include<stdio.h>
a = int(input())
b = int(input())
m = int(input())
N = int(input())
 
total = 0 
total += a 
if a >= m:
    print(total)
    exit()
total += b 
if b >= m:
    print(total)
    exit()
day1, day2 = a, b 
for i in range(3, N + 1):
    current = day1 + day2
    if current >= m:
        total += current 
        print(total)
        exit()
    total += current 
    day1, day2 = day2, current 
 
print(total)