import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1]
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
def solve():
L, n = mii()
l = mii()
cnt = 0
while L != 0:
L = l[L - 1]
cnt += 1
print(cnt)
if __name__ == "__main__":
tc = ii()
for t in range(tc):
print(f"Data Set {t+1}:")
solve()
print()