n = int(input())
X = []
Y = []
Z = []
W = []
for _ in range(n):
    x, y = map(str, input().split())
    if x != "0":
        if not "." in x:
            X.append(int(x) * 10**10)
        else:
            x += "0" * 20
            ind = x.index(".")
            x = int(x[:ind] + x[ind+1:ind+11])
            X.append(x)
    x = y
    if x != "0":
        if not "." in x:
            Y.append(int(x) * 10**10)
        else:
            x += "0" * 20
            ind = x.index(".")
            x = int(x[:ind] + x[ind+1:ind+11])
            Y.append(x)

for _ in range(n):
    x, y = map(str, input().split())
    if x != "0":
        if not "." in x:
            Z.append(int(x) * 10**10)
        else:
            x += "0" * 20
            ind = x.index(".")
            x = int(x[:ind] + x[ind+1:ind+11])
            Z.append(x)
    x = y
    if x != "0":
        if not "." in x:
            W.append(int(x) * 10**10)
        else:
            x += "0" * 20
            ind = x.index(".")
            x = int(x[:ind] + x[ind+1:ind+11])
            W.append(x)

if len(X):
    x = min(X)
    z = min(Z)
    print(z/x)
else:
    y = min(Y)
    w = min(W)
    print(w/y)