def binpow(a, b):
if b == 0:
return 1
if b % 2 == 0:
c = binpow(a, b // 2)
return (c * c) % mod
return (binpow(a, b - 1) * a) % mod
def divi(a, b):
return (a * binpow(b, mod - 2)) % mod
mod = 1e9 + 7
def solve():
n = int(input())
l = 1
r = 1e9
ans = -1
while l <= r:
mid = (l + r) // 2
sum = mid * (mid + 1) // 2
if sum >= n:
ans = mid
r = mid - 1
else:
l = mid + 1
# Correct calculation for 'val'
val = (ans * (ans + 1) // 2 - n) * 2 + (ans - 1)
print(val)
if __name__ == "__main__":
tt = 1 # Change this to int(input()) for multiple test cases
while tt:
solve()
tt -= 1
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
20 ms |
19260 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
