#include <stdio.h>
 
int main(){
   // int t;
   // scanf("%d", &t);
 
    //while(t--) {
        int n;
        scanf("%d", &n);
 
        int a, b;                 // response = a, quality = b
        int bestQuality = -1;     // সর্বোচ্চ কোয়ালিটি
        int bestIndex = -1;       // তার ইনডেক্স
 
        for(int i = 1; i <= n; i++) {
            scanf("%d %d", &a, &b);
 
            if(a <= 10) {                   // শুধু 10 এর কম বা সমান শব্দ গ্রহণ
                if(b > bestQuality) {       // আগের quality এর সাথে তুলনা
                    bestQuality = b;
                    bestIndex = i;          // index মনে রাখা
                }
            }
        }
 
        printf("%d\n", bestIndex);          // শেষে index প্রিন্ট
   // }
 
    return 0;
}
 

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