A machine component is subjected to a 2D stress state. The tensile stress in the X-direction varies from 40 MPa to 100 MPa while that in the Y-direction ranges from 10 MPa to 80 MPa. The corrected endurance limit of the component is 270 MPa and the ultimate tensile strength is 660 MPa. As per the Goodman’s theory, the factor of safety considered by the designer is _________