A field vane shear testing instrument (shown alongside) was inserted completely into a deposit of soft, saturated silty clay with the vane rod vertical such that the top of the blades were 500 mm below the ground surface. Upon application of a rapidly increasing torque about the vane rod, the soil was found to fail when the torque reached 4.6 N. Assuming mobilization of untrained shear strength on all failure surface to be uniform and the resistance mobilized on the surface of the vane rod to be negligible, what would be the peak untrained shear strength (rounded off to the nearest integer value of kPa) of the soil?