程序代码：

#include <stdio.h>

int main( void )
{
    unsigned n;
    unsigned long long x;
    unsigned opt[100];
    unsigned long long opd[100];
    scanf( "%u%llu", &n, &x );
    for( unsigned i=0; i!=n; ++i )
        scanf( "%u%llu", &opt[n-i-1], &opd[n-i-1] );

    for( unsigned i=0; i!=n; ++i )
    {
        switch( opt[i] )
        {
        case 1: x-=opd[i]; break;
        case 2: x+=opd[i]; break;
        case 3: x/=opd[i]; break;
        case 4: x*=opd[i]; break;
        }
    }
    printf( "%llu\n", x );
}