Suppose we observe the 3-year Treasury security rate (1R3) to be 8 percent, the expected 1-year rate next year,(E(2r1), to be 4 percent, and the expected 1-year rate the following year, E(3r1), to be 6 percent. If the unbiased expectations theory of the term structure of interest rates holds, what is the 1-year Treasury security rate, 1R1?