#include<stdio.h>
int n,m,k,i,in[100001],sf[100001];
int main()
{
	freopen("stergeri.in","r",stdin);
	freopen("stergeri.out","w",stdout);
	scanf("%d%d%d",&n,&m,&k);
	for(i=1;i<=m;++i)
		scanf("%d%d",&in[i],&sf[i]);
	for(i=m;i>=1;--i)
		if(k>=in[i])
			k=k+sf[i]-in[i]+1;
	printf("%d",k);
	return 0;
}