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#include<cstdio>
unsigned G,w,i,min,EG[10001],CG[10001];
int main(){
FILE*f=fopen("energii.in","r");
FILE*h=fopen("energii.out","w");
fscanf(f,"%lu",&G);
fscanf(f,"%lu",&G);
for(i=0;i<G;i++){
fscanf(f,"%lu %lu",&EG[i],&CG[i]);
if(EG[i]>=w) min=EG[i];
}
if(min==0&&w!=0) fprintf(h,"-1");
else fprintf(h,"%u",min);
fclose(f);fclose(h);
return 0;
}