#include<stdio.h>
int v[100];
int main()
{int n, m, k, x, y, i, j, l, p;
FILE *f=fopen ("stergeri.in","r");
FILE *g=fopen ("stergeri.out","w");
fscanf (f, "%d %d %d", &n, &m, &k);
for (i=1;i<=n;i++) v[i]=i;
for (i=1;i<=m;i++) {fscanf (f, "%d %d", &x, &y);
		    for (j=x;j<=y;j++) v[j]=0;  
  
                    for (l=1;l<=n;l++) if (v[l]==0) {for (p=l;p<=n;p++) v[p]=v[p+1];
						     n--;l--;}
                    }

for (i=1;i<=n;i++) if (i==k) fprintf (g, "%d\n", v[i]);
fclose(f);
fclose(g);
return 0;
}