S1, S2, S3, S4, S5, S6 and S7 are seven students. S6 is taller than S5 but shorter than S4. S3 and S2 are shorter than S1. S5 is shorter than S3 but taller than S2. S2 is the shortest among them. S7 is shorter than S5. How many students are taller than S5?
1
2
2
5
3
4
4
3