/* package whatever; // don't place package name! */
 
import java.io.*;
import java.util.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class LoansomeCarBuyer
{
	public static void main (String[] args)
	{
		// Input
		Scanner scanner = new Scanner(System.in);
        int term = scanner.nextInt();
        while (term >= 0) {
 
            double downPayment = scanner.nextDouble();
            double loan = scanner.nextDouble();
 
            double initialValue = downPayment + loan;
            double payment;
            if (term != 0) {
                payment = loan / term;
            } else {
                payment = loan;
            }
 
            int numRecords = scanner.nextInt();
 
            int[] months = new int[numRecords];
            double[] values = new double[numRecords];
 
            for (int i = 0; i < numRecords; i++) {
            	months[i] = scanner.nextInt();
            	values[i] = scanner.nextDouble();
            }
 
            // Calculation.
            double prev = values[0];
            double currentValue = initialValue - initialValue * prev;
            double owe = loan;
            int currentMonth;
 
            if (currentValue > owe) {
            	currentMonth = 0;
            } else {
	            int i = 1;
	            currentMonth = 1;
 
	            while (true) {
 
	            	if (i < numRecords && currentMonth == months[i]) {
	            		prev = values[i];
	            		i++;
	            	}
 
	            	currentValue = currentValue - currentValue * prev;
	            	owe -= payment;
 
	            	if (currentValue > owe) break;
 
	            	currentMonth++;
	            }
            }
 
            if (currentMonth == 1) {
            	System.out.println(currentMonth + " month");
            } else {
            	System.out.println(currentMonth + " months");
            }
 
            term = scanner.nextInt();
        }
        scanner.close();
	}
}

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

30 500.0 15000.0 3
0 .10
1 .03
3 .002
12 500 9999.99 2
0 .05
2 .1
60 2400.0 30000.0 3
0 .2
1 .05
12 .025
100 0 60000 101
0 .1
1 .1
2 .01
3 .01
4 .1
5 .1
6 .01
7 .01
8 .01
9 .01
10 .1
11 .01
12 .01
13 .01
14 .01
15 .01
16 .01
17 .01
18 .01
19 .01
20 .1
21 .01
22 .01
23 .01
24 .01
25 .01
26 .01
27 .01
28 .01
29 .01
30 .1
31 .01
32 .01
33 .01
34 .01
35 .01
36 .01
37 .01
38 .01
39 .01
40 .1
41 .01
42 .01
43 .01
44 .01
45 .01
46 .01
47 .01
48 .01
49 .01
50 .1
51 .01
52 .01
53 .01
54 .01
55 .01
56 .01
57 .01
58 .01
59 .01
60 .1
61 .01
62 .01
63 .01
64 .01
65 .01
66 .01
67 .01
68 .01
69 .01
70 .1
71 .1
72 .1
73 .1
74 .1
75 .01
76 .01
77 .01
78 .01
79 .01
80 .1
81 .1
82 .1
83 .1
84 .1
85 .1
86 .1
87 .1
88 .1
89 .1
90 .1
91 .1
92 .1
93 .01
94 .01
95 .01
96 .1
97 .1
98 .1
99 .1
100 .1
100 0 75000 2
0 .10
99 .5
100 74999 1 1
0 .20
36 2000 10000 4
0 .2
1 .1
3 .01
10 .005
36 0 12000 3
0 .25
1 .1
10 .005
23 3000 5000 2
0 .15
20 .005
42 4000 0 1
0 .79
-10 0 0 4