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#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
int main()
{
ifstream in;
ofstream out;
in.open("input.txt");
out.open("output.txt");
char ch;
string numero, val[2];
int oraVuota = -1, giorno[96], i = 0, c = 0;
for(int j = 0; j < 96; j++) giorno[j] = -1;
getline(in, numero);
int N;
istringstream(numero) >> N;
int ore[N][2];
while(!in.eof())
{
in.get(ch);
if(ch == '\n') {
val[0] = "";
val[1] = "";
i = 0;
c++;
continue;
}else if(ch == ' '){
i++;
}else {
val[i] += ch;
istringstream(val[i]) >> ore[c][i];
}
}
i = 0;
while(i < N){
if(ore[i][0] > ore[i][1]){
for(int j = ore[i][0]; j < ore[i][1] || j < 96; j++) giorno[j] = 0;
for(int k = ore[i][1]-1; k >= 0; k--) giorno[k] = 0;
}else {
for(int k = ore[i][0]; k < ore[i][1]; k++) giorno[k] = 0;
}
i++;
}
for(i = 0; i < 96; i++) {
if(giorno[i] == -1) {
oraVuota = i;
break;
}
//cout << i << " " << giorno[i] << endl;
}
out << oraVuota << endl;
in.close();
out.close();
return 0;
}
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