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practice

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	`1`	`+package Prep;`
	`2`	`+`
	`3`	`+import java.util.Scanner;`
	`4`	`+`
	`5`	`+public class TrafficLightGreen {`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+ public static void main(String[] args) {`
	`10`	`+`
	`11`	`+ Scanner sc = new Scanner(System.in);`
	`12`	`+`
	`13`	`+ int n = sc.nextInt();`
	`14`	`+ int arr[] = new int[n];`
	`15`	`+ int temp[] = new int[n];`
	`16`	`+ for (int i = 1; i <= n; i++) {`
	`17`	`+ char bulb = sc.next().charAt(0);`
	`18`	`+`
	`19`	`+ if (bulb == 'G')`
	`20`	`+ arr[i] = 0;`
	`21`	`+ if (bulb == 'R')`
	`22`	`+ arr[i] = 1;`
	`23`	`+ if (bulb == 'Y')`
	`24`	`+ arr[i] = 2;`
	`25`	`+ }`
	`26`	`+`
	`27`	`+ int k = sc.nextInt();`
	`28`	`+ int sum = 0;`
	`29`	`+ int a = 0, b = 0, answer = 0;`
	`30`	`+ for (int i = 1; i <= n; i++) {`
	`31`	`+ arr[i] += sum;`
	`32`	`+ if ((arr[i] + 1) % 3 == 0) {`
	`33`	`+ temp[i] = 1;`
	`34`	`+ answer += 1;`
	`35`	`+ sum += 1;`
	`36`	`+ } else if ((arr[i] + 2) % 3 == 0) {`
	`37`	`+ temp[i] = 2;`
	`38`	`+ answer += 2;`
	`39`	`+ sum += 2;`
	`40`	`+ } else`
	`41`	`+ temp[i] = 0;`
	`42`	`+ if (i >= k)`
	`43`	`+ sum = sum - temp[++a];`
	`44`	`+ }`
	`45`	`+`
	`46`	`+ System.out.println(answer);`
	`47`	`+`
	`48`	`+ }`
	`49`	`+`
	`50`	`+}`

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