Iterate Nofb

a, b = input().split()
n = int(a + b)

flag = False
for i in range(n):
    if i ** 2 == n:
        flag = True
        break

print('Yes' if flag else 'No')

# Improved version:

a, b = input().split()
n = int(a + b)

flag = False
i = 0
while i * i <= n:
    if i * i == n:
        flag = True
        break
    i += 1

print('Yes' if flag else 'No')

### END ###

def main():
    N, *A = map(int, open(0).read().split())
    remaining = 0
    cur = 0  # current index
    for target in range(1, N + 1):
        be_kept = False
        for i in range(cur, N):
            if A[i] == target:
                remaining += 1
                cur = i + 1
                be_kept = True
                break
        if not be_kept:
            break
    print(N - remaining if remaining else -1)

# Improved version:

def main():
    N, *A = map(int, open(0).read().split())
    remaining = 0
    target = 1
    for i in A:
        if i == target:
            remaining += 1
            target += 1
    print(N - remaining if remaining else -1)


if __name__ == '__main__':
    main()

### END ###

import numpy as np

N = int(input())
n=int(np.sqrt(N))
print(n**2)


# Improved version:

N = int(input())
n = int(N**0.5) 
print(n**2)

### END ###

import numpy as np
A = np.arange(1<<27,dtype=np.int32)


a,b = map(int,input().split())
if (a-b) % 2 == 0:
  print((a+b)//2)
else:
  print('IMPOSSIBLE')

# Improved version:

import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

A,B = map(int,read().split())

q,r = divmod(A+B,2)

if r == 1:
    print('IMPOSSIBLE')
else:
    print(q)

### END ###