How many world tours has Katy Perry been on?
4
2
2
1
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
4
2
1
3
4
2
1
3
4
2
1
3
4
2
1
3
4
2
1
3
4
2
1
3
4
2
1
5
3
4
2
1
5
3
4
1
5
3
4
5
0
3
4
5
0
4
5
4
0
5
6
4
5
0
6
4
5
6
0
4
7
5
6
4
0
7
5
6
4
7
5
0
6
4
7
5
6
0
4
7
8
5
6
0
7
8
5
6
7
8
5
0
6
7
8
5
6
0
7
8
5
6
7
8
5
6
7
8
5
6
7
8
6
7
8
13
6
2 tours
7
8
13
6
9
7
8
13
6
10
9
2 tours
7
8
13
6
10
9
7
8
13
6
11
10
9
3 tours
2 tours
7
8
13
11
10
9
14
7
8
13
11
10
9
14
3 tours
2 tours
7
8
12
13
ten
11