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import java.util.Vector;

public class test {
	public static void main(String[] args) {
		String triangle = "75\n"+
			"95 64\n"+
			"17 47 82\n"+
			"18 35 87 10\n"+
			"20 04 82 47 65\n"+
			"19 01 23 75 03 34\n"+
			"88 02 77 73 07 63 67\n"+
			"99 65 04 28 06 16 70 92\n"+
			"41 41 26 56 83 40 80 70 33\n"+
			"41 48 72 33 47 32 37 16 94 29\n"+
			"53 71 44 65 25 43 91 52 97 51 14\n"+
			"70 11 33 28 77 73 17 78 39 68 17 57\n"+
			"91 71 52 38 17 14 91 43 58 50 27 29 48\n"+
			"63 66 04 68 89 53 67 30 73 16 69 87 40 31\n"+
			"04 62 98 27 23 09 70 98 73 93 38 53 60 04 23";	

		String[] lines = triangle.split("\n");
		Vector> map = new Vector>();
		//populate vector
		for(int i = 0; i < lines.length; i++){
			String[] line = lines[i].split(" ");
			Vector sub = new Vector();
			for(int j=0;j-1;i--){
			Vector sub = map.get(i);
			Vector prev = map.get(i+1);
			for(int j=0;j prev.get(j+1) ? prev.get(j) : prev.get(j+1))); 
			}
		}
		
		System.out.println(map.get(0).get(0));
	}
}