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Chocolate.java

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import java.util.Scanner;

public class Chocolate

{

public static void main( String[] args )

{

Scanner s = new Scanner( System.in );

int n =Integer.parseInt( s.nextLine() );

long ways =1;

long count=1;

boolean started = false;

for(int i=0;i<n;i++)

{

//System.out.println( s.nextInt() );

int piece = s.nextInt();

if(started && piece==0)

{

count++;

}

if(started && piece==1)

{

ways*=count;

count=1;

}

if(piece==1)

{

started = true;

}

}

if(started==false)

ways=0;

System.out.println( ways );

}

}