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import sys

n, m, s = map(int, sys.stdin.readline().split())

bud = range(1, n+1) # domki
zaj = set()
for rn in range(m):
    l, r = map(int, sys.stdin.readline().split())
    for i in range(l, r+1):
        zaj.add(i)

wol = sorted(set(bud) - zaj)

dis = [abs(s-x) for x in wol]

cls = [i for i, x in enumerate(dis) if x == min(dis)]

p = min([wol[cls[0]] for i in cls])

print(p)