Seven Students P, Q, R, S, T, U and V are the top rankers in the class, No two people got the same rank. The student with the highest marks is given rank 1 and the lowest mark got rank 7. Q got less marks than R but more than T, V got more marks than S. U got more marks than P but less than S. Q got the second least rank and S got the second highest rank. R got less marks than P. Who got the least marks?