Buggy python submission (verdict: Time Limit Exceeded):
import math

n, k = map(int, input().split(" "))
li = list(map(int, input().split(" ")))

fk = k
crnt = 1
st = set()
wl = []
key = crnt
cy = 0
mg = 0

for i in range(n):
    if crnt in st:
        key = crnt
        cy = i - wl.index(crnt)
        mg = wl.index(crnt)
        break
    st.add(crnt)
    wl.append(crnt)
    crnt = li[crnt - 1]

k -= mg
if cy != 0:
    k %= cy
crnt = key
if n > k:
    k = fk
    crnt = 1
for i in range(k):
    crnt = li[crnt - 1]

print(crnt)


Fixed submission:
import math

n, k = map(int, input().split(" "))
li = list(map(int, input().split(" ")))

fk = k
crnt = 1
st = set()
wl = []
key = crnt
cy = 0
mg = 0

for i in range(n):
    if crnt in st:
        key = crnt
        cy = i - wl.index(crnt)
        mg = wl.index(crnt)
        break
    st.add(crnt)
    wl.append(crnt)
    crnt = li[crnt - 1]

k -= mg
if cy != 0:
    k %= cy
crnt = key
if n > fk:
    k = fk
    crnt = 1
for i in range(k):
    crnt = li[crnt - 1]

print(crnt)

Buggy python submission (verdict: Runtime Error):
import math

n, k = map(int, input().split(" "))
aL = list(map(int, input().split(" ")))
aFL = [False for _ in range(n)]

crnt = 1
cnt1 = 0
while True:
    if aFL[crnt - 1]:
        break
    cnt1 += 1
    aFL[crnt - 1] = True
    crnt = aL[crnt - 1]

wCrnt = crnt
cnt2 = 0
while True:
    crnt = aL[crnt - 1]
    cnt2 += 1
    if crnt == wCrnt:
        break

gp = cnt1 - cnt2

cr = crnt
for i in range((k - gp) % n):
    cr = aL[cr]

print(aL[aL[cr - 1]])


Fixed submission:
import math

n, k = map(int, input().split(" "))
li = list(map(int, input().split(" ")))

fk = k
crnt = 1
st = set()
wl = []
key = crnt
cy = 0
mg = 0

for i in range(n):
    if crnt in st:
        key = crnt
        cy = i - wl.index(crnt)
        mg = wl.index(crnt)
        break
    st.add(crnt)
    wl.append(crnt)
    crnt = li[crnt - 1]

k -= mg
if cy != 0:
    k %= cy
crnt = key
if n > fk:
    k = fk
    crnt = 1
for i in range(k):
    crnt = li[crnt - 1]

print(crnt)

Buggy python submission (verdict: Runtime Error):
import math

n, k = map(int, input().split(" "))
aL = list(map(int, input().split(" ")))
aFL = [False for _ in range(n)]

crnt = 1
cnt1 = 0
while True:
    if aFL[crnt - 1]:
        break
    cnt1 += 1
    aFL[crnt - 1] = True
    crnt = aL[crnt - 1]

wCrnt = crnt
cnt2 = 0
while True:
    crnt = aL[crnt - 1]
    cnt2 += 1
    if crnt == wCrnt:
        break

gp = cnt1 - cnt2

cr = wCrnt
for i in range((k - gp) % n):
    cr = aL[cr]

print(aL[cr])


Fixed submission:
import math

n, k = map(int, input().split(" "))
li = list(map(int, input().split(" ")))

fk = k
crnt = 1
st = set()
wl = []
key = crnt
cy = 0
mg = 0

for i in range(n):
    if crnt in st:
        key = crnt
        cy = i - wl.index(crnt)
        mg = wl.index(crnt)
        break
    st.add(crnt)
    wl.append(crnt)
    crnt = li[crnt - 1]

k -= mg
if cy != 0:
    k %= cy
crnt = key
if n > fk:
    k = fk
    crnt = 1
for i in range(k):
    crnt = li[crnt - 1]

print(crnt)

Buggy python submission (verdict: Runtime Error):
import math

n, k = map(int, input().split(" "))
aL = list(map(int, input().split(" ")))
aFL = [False for _ in range(n)]

crnt = 1
cnt1 = 0
while True:
    if aFL[crnt - 1]:
        break
    cnt1 += 1
    aFL[crnt - 1] = True
    crnt = aL[crnt - 1]

wCrnt = crnt
cnt2 = 0
while True:
    crnt = aL[crnt - 1]
    cnt2 += 1
    if crnt == wCrnt:
        break

gp = cnt1 - cnt2

cr = aL[0] - 1
for i in range((k - gp) % n):
    cr = aL[cr - 1]

print(aL[cr])


Fixed submission:
import math

n, k = map(int, input().split(" "))
li = list(map(int, input().split(" ")))

fk = k
crnt = 1
st = set()
wl = []
key = crnt
cy = 0
mg = 0

for i in range(n):
    if crnt in st:
        key = crnt
        cy = i - wl.index(crnt)
        mg = wl.index(crnt)
        break
    st.add(crnt)
    wl.append(crnt)
    crnt = li[crnt - 1]

k -= mg
if cy != 0:
    k %= cy
crnt = key
if n > fk:
    k = fk
    crnt = 1
for i in range(k):
    crnt = li[crnt - 1]

print(crnt)