# include <stdio.h>

int main(){
	int a, b, d;
	int max, c = 0;
	int group[7] = {0};
	for (int i = 0; i<7; i++){
		scanf("%d %d", &a, &b);
		int sum = a + b;
		group[i] = sum;
	}

	for (int x = 0; x<7; x++){
		if (group[x] <= 8) c = 0;        //高兴 
		else{
			c = 1;
			break;
		}
	}
	
	if (c == 1){
		for (int w = 0; w<7; w++){	
			if (group[w] > max){
				max = group[w];
				d = w+1;
			}	
		}
		printf("%d", d);	
	}
	else printf("0");
	
	
	return 0;
}