#include<stdio.h>
int main(){
int i,a,b,c;
int d=0;
int bad=8;
int day;
for(i=1;i<=7;i++){
scanf("%d %d",&a,&b);
c=a+b;
if(c>bad)
{
bad=c;
day=i;
d=1;
}
}if(d==0){
	printf("0");
}else{
	printf("%d",day);
}

return 0;}