#include<cstdio>
int a[7],b[7];
int isnt_happy(){
    int max_nothappy_time=0,min_days=0;
    for(int i=0;i<7;i++){
        if(((a[i]+b[i])>max_nothappy_time)&&((a[i]+b[i])>8)){max_nothappy_time=a[i]+b[i];min_days=++i;}
    }
    return min_days;
}
int main(){
    for(int i=0;i<7;i++) scanf("%d%d",&a[i],&b[i]);
    printf("%d\n",isnt_happy);
    return 0;
}