import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
a, b, c = mii()
for i in range(0, 101):
if 8 * i >= 1800 - 3 * a - 4 * b - 5 * c:
print(i)
return
print("impossible")
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
d = solve()