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